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Time: the most familiar, and most mysterious quality of the physical universe. Theoretical physicist Brian Greene, PhD, has been challenged to explain the nature of time to 5 different people; a child, a teen, a college student, a grad student, and an expert. Director: Maya Dangerfield Producer: Wendi Jonassen Field Producer: Katherine Wzorek Director of…
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Roo sh
April 19, 2023 at 5:10 pm
The universal is shaped like a donut, and that isn’t a Simpsons joke. 😊
Sam Davani
April 19, 2023 at 5:10 pm
wow.
as a science student i get tons of nostalgia watching videos like this
RBR
April 19, 2023 at 8:17 pm
Lucky for you! Science and Math for me was introduced in a rather boring rote memorization subjects. I hope the new generations get an even more exciting introduction.
muhammad ali
April 19, 2023 at 5:14 pm
Hey that’s Borat not a Genius student
DizzyDaddy
April 19, 2023 at 5:16 pm
Lvl 1 to 2 escalated quickly…
D L
April 19, 2023 at 5:27 pm
That went a lot further into existentialism than I thought it would. Fun video!
only for study
April 19, 2023 at 6:06 pm
This amazing video, gives a lot of information
Brucifer
April 19, 2023 at 6:10 pm
Forgive my ignorance, but would traveling back in time not require an amount of “negative energy” (whatever that is)?
I may be way off the mark there though since its not my field.
Tetris1188
April 19, 2023 at 8:46 pm
The progression of time is constant… the perception of time is relative
dominic cirineo
April 19, 2023 at 6:12 pm
The whole time the grad student just looked like he was really vibing out to some good jazz, lmaoo
One punch Podcast
April 19, 2023 at 6:24 pm
Everything honestly points to block time
Once Some Fun A Time
April 19, 2023 at 6:46 pm
Time only exists in our minds
Steven Brewer
April 19, 2023 at 6:53 pm
Time for an aspirin!
Panagiotis Kevopoulos
April 19, 2023 at 6:58 pm
Two formally dressed up physics experts in suits trying to comprehend time and the complexities of the universe yet their socks are some weirdly shaded checkboard and colorful flying fairies.
Qasim Sikander
April 19, 2023 at 7:08 pm
I know about all the time travel voodoo but I never made the connection that I’ll exist forever in my little bubble of time. Absolutely crazy to think about
Darts Gondel
April 19, 2023 at 7:18 pm
Love how he lights up when she confirms she has heard of albert einstein
The Dellow
April 19, 2023 at 7:21 pm
Brian Greene reminds me a bit of Bill Maher 🤔
Steven Banks
April 19, 2023 at 7:36 pm
I’m having trouble at “child level”
Joshua Karanja
April 19, 2023 at 7:48 pm
Did anyone else notice any resemblance of the grad student and a certain famous guy?
TheSlimDude
April 19, 2023 at 8:01 pm
Deep. Generally enjoyable content 👍
RBR
April 19, 2023 at 8:12 pm
The grad student could play Einstein in his younger years.
Navajo Ninja
April 19, 2023 at 8:29 pm
Time exists only in memory.
Everything is just happening.
Animals dont experience time like we do.
Tetris1188
April 19, 2023 at 8:50 pm
Everything experiences time, but not all things perceive time.
Mos Baked
April 19, 2023 at 8:35 pm
Briane Greene is such a fantastic communicator, loved this episode
Raisa Real
April 19, 2023 at 8:48 pm
Maria’s outfit>
Earth2Stephen
April 19, 2023 at 8:58 pm
This may be a dumb question, but if space is expanding, and energy degradation or entropy is increasing, is time also being altered in some way, or is it remaining constant?
Joel Connell
April 19, 2023 at 9:20 pm
Imagine if that little girl did just stop moving through time when he asked.
109 Aushik Singh
April 20, 2023 at 11:55 am
i presume…that in…not only in science…..but in other courese as well…..looking at things and specially with science…..without using nomenclature……just like looking at an atom without names……u get to see more absurd forms of reality that it could have described itself and more relating relationality between things……and precisely in screen on a pc without any one…..which creates one of the debates of living things and non living things…..and the conclusion that it leads to is….just u peobably might have never understood before …..u could never countrol ur body as the u are made up of atoms and atoms works in itself and not because of you….as u are collection of atoms🤒🥵😅…..if u spend ur life all alone on pc…….after watching 25 gaming videos and a lot of animes….utube recommends u watching these videos and therefore making u realise and advertising u these things as a free thinkers….and therefore making u realise what other things are happning in the worlds ……….which r very serious
-
April 20, 2023 at 12:23 pm
As soon as he gets to the 16 year old, I’m done.
Savannah Childress
April 20, 2023 at 12:40 pm
Look away for a moment and you’ll swear George Clooney is suddenly a theoretical physicist
Snitsie
April 20, 2023 at 12:41 pm
19:50 Prisoner of Azkaban
Omar Toren
April 20, 2023 at 12:48 pm
Poor teen. He lost me.
Hugh MacDonald
April 20, 2023 at 1:37 pm
Lol. Skip. At LEAST 23 minutes too long. Narcissism bloviates.
Smokinthehippies
April 20, 2023 at 1:41 pm
Love that you guys do these videos!
Thomaz
April 20, 2023 at 2:04 pm
This is incredible physics about time
Jansen Art
April 20, 2023 at 2:43 pm
9:40 Uh, we already are. Satellite communications have to take into account relativistic changes in time.
Jansen Art
April 20, 2023 at 2:55 pm
13:30 In terms of simple elastic interactions, the line of time is not possible to determine. This is indeterminate as an effect even on the macro level, in microgravity; it doesn’t have to be on a quantum or atomic level. For a video of a ball hitting a wall or another ball in a space station (a simple, perfect elastic interaction), in isolation of other more complex events, it will be impossible to determine if it’s going forwards or backwards. The keys to determining time are gravity and entropy.
Marcel Janssens
April 20, 2023 at 3:00 pm
That grad student looks a bit like Einstein 😮
Akhil Ajith
April 20, 2023 at 3:14 pm
🫡
blueckaym
April 20, 2023 at 3:16 pm
Staying stationary in Space is just as difficult as in Time.
Well you can do it if you ignore all the known motions that happen (like rotation of Earth around its axis, around the Sun, rotation of the Sun in Milky way, Milky Way travel in our galaxy cluster, our motion to the mysterious Great Attractor…) and only look at the walls around you, but I’m not sure if that’s very scientific.
We actually often do similar ignoring of time despite that we very well know it still runs.
For example when we communicate or react to other stimuli around us we’re used to think it happens instantaneously.
But we know that we take time to react even when we do it asap and without thinking.
But we can’t really feel the delay of perceiving things. To our brain they just happen instantaneously when we perceive them, but in-fact that’s the end of the perceiving process, which also takes time.
Also we like to pause Time when thinking about something, no matter if it’s a scientific, engineering or social or personal concept … we often imagine what happens in a specific moment in Time, despite that it takes us a looong time to even imagine it.
So while we like to think that we can be stationary in Space and Time, we actually can’t do it in either.
kouna boy
April 20, 2023 at 3:26 pm
12:38 to disentangle rather than to reentangle. Well, setting paths subject to observation they will probabilisticly distribute into a density at the aperage of the gauge of the eigenfunction. Obviously syntactic equations develop a tendency to increase entropy. Imagine a tendency to lower entropy, that would mean the gauge would be precisely and chirped into a unique distribution and the energy carried would be higher than the set of initial conditions. It’s not a clear statement that entropy increase is the unvoluntary presentation conditions of a substitute of an averaging derivate to fully synthesize a period equivalency.
blueckaym
April 20, 2023 at 3:32 pm
A question about the Einstein Clock:
I understand the Math explaining the Time delay – that’s rather simple.
But I wonder about such clock being possible at all, and specifically the properties of light (or photons).
What I mean is that light is wave and it has momentum in the direction of its propagation.
But in the moving mirrors clock we assume that a photon shot straight up (when stationary) would actually move diagonally when the whole clock is moving (and would even change it’s lateral acceleration together with the acceleration of the clock itself).
What I mean is how do we know that a massless photon that only has momentum in the direction of its propagation would move (and accelerate) sideways together with moving (and accelerating) clock?
Ie how do we know that the photon won’t try to travel the “stationary” vertical line and basically fall behind the moving clock?
But then again if that’s not possible how the observed time dilation of radioactive elements getting longer half-life when moving closer to the speed of light works?
Christopher Kovalcheck
April 20, 2023 at 3:49 pm
Okay he already lost me at the “teen” chapter. Never in a billion years could I understand any of this lol.
blueckaym
April 20, 2023 at 4:22 pm
One thing all of us have to be more careful is to stop trying to explain things with our description of the thing.
Yes very often that’s all we have – a description (for example Time is what we measure by Clocks). But description is by definition very subjective and only valid in specific context
What I mean is that descriptions we’ve made are bothering with how that thing manifests (in our experience) and how could we eventually predict it, but it rarely explains how it works.
It’s the same story with the statistical description of Entropy and its description of Time. It states certain probabilities but no specific mechanism to why it works that way, and as in the case with statistical Entropy it sometimes opens doors to what we consider to be impossible (for example unlikely decrease in Entropy in some area, which if we take the statistical Entropy description of Time too seriously would mean that in that area Time ran backwards for at least short while).
It’s the same story with statements like “This is a thing that must obey these equations”, well that’s wrong – even if our equations are somehow perfect the logic is reversed – our equations describe Reality, but Reality doesn’t care about obeying our descriptions.
For example one could be tempted (and probably many actually were) to say in the past that Gravity must obey Newton’s equations, which would be fine most of the time (as long as we don’t pay attention to direction of causality and these equations produce correct results) … but then a planet like Mercury for example might “suddenly” decide to disobey those equations and orbit the Sun slightly differently.
So who was wrong? Newton or Mercury? 🙂
The trouble with saying things like “must obey these equations” or “is what we measure by these devices” is that automatically close the doors to explaining that respective thing.
And thus reducing the chances (or making it much more difficult) for someone to discover something new in that field as it has all been measured and must obey … you get it 🙂
Andy Wilson
April 20, 2023 at 5:50 pm
Let’s go Brian!!!!!!
Alan Deli
April 20, 2023 at 5:50 pm
I tell you, Nay: but, except ye repent, ye shall all likewise perish. (Luke 13:5 [KJV])
And as it is appointed unto men once to die, but after this the judgment: (Hebrews 9:27)
Enter ye in at the strait gate: for wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat: Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it. (Matthew 7:13-14)
For whosoever shall call upon the name of the Lord shall be saved. (Romans 10:13)
Brian Hollenbeck
April 20, 2023 at 6:38 pm
I can move in time see I’m already in the future
TheMarquis
April 20, 2023 at 7:21 pm
Sheldon was right to mock him in that episode….
Brandon Freeman
April 20, 2023 at 7:34 pm
What is the text Dr. Porrati eludes to near the end? I would like to read it. Anyone know?
the UN = MASS MURDERERS
April 20, 2023 at 7:37 pm
I don’t know how much I understand time, but I know that I’ll understand none of it after seeing this video
pfoetel
April 20, 2023 at 9:17 pm
Brian would make a great math/physics teacher. He is an encyclopedia on two legs.
Busas Gaming
April 20, 2023 at 9:21 pm
Massimo Porrati has awesome socks.
Filip Yakimov
April 21, 2023 at 8:12 am
Time concept is much better explained in DHIMS in the time episode. I am sure you will like it !
Blue Moon Studios
April 21, 2023 at 8:12 am
That poor high school student. She was lost. So was I… lol
Steven Adler
April 21, 2023 at 8:49 am
Time is just structure in action. Time is relative and derivative and ultimately just a mathematical convenience. Time can be transformed out of the equations of motion. Therefore time equals change.
Alejandro Gallegos
April 21, 2023 at 10:38 am
4:08 Time is a tool you can put on the wall
Or wear it on your wrist
HP K
April 21, 2023 at 11:18 am
At 16:20, Professor Greene seems he was talking to young Einstein.😊
Agraj Yadav
April 21, 2023 at 11:59 am
YESSS HE S BACK !!!!!
bangupjobasusual
April 21, 2023 at 12:15 pm
Jesus that second student is sharp
Cogi the Fool
April 21, 2023 at 12:56 pm
Level 6: Time Traveller
Aryan Singh
April 21, 2023 at 1:11 pm
My fully grown mind literally has taken more time than that 9yo to understand a simple thing,
swgeezer
April 21, 2023 at 1:52 pm
i am a first year graduate student and I got lost at the high schooler stage
kyran barrera mccourt
April 21, 2023 at 2:18 pm
Physicist Tom cambell does this much better
Owen L
April 21, 2023 at 2:58 pm
So lucky to have had Dr. Greene as my professor, such a great lecturer and educator. I recently asked him a question about relativity, and his answer was so well articulated despite being almost instant. I’m really glad to see him featured in this series!
Anthony DeRosa
April 21, 2023 at 3:25 pm
Couldn’t keep up…tried to create his mirrored light clock…glass everywhere
radan v
April 21, 2023 at 4:12 pm
Succint. Efficient. Beautiful.
Anmol Jain
April 21, 2023 at 4:19 pm
does wired think its a crime to select any normal looking student? Either female or trans, never a straight male.
Raphael Garcia
April 21, 2023 at 4:24 pm
27:15 would love to hear more on Time potentially being an emergent phenomena due to the expansion of spacetime.
Raphael Garcia
April 21, 2023 at 4:26 pm
28:26 time passing being a perspective directly translates to no free will. How would you prove that experimentally?
Raphael Garcia
April 21, 2023 at 4:29 pm
Is gravity due to the gradient of spacetime instead of the way we typically think of time passing more slowly around greater gravity?
aniket mahapure
April 21, 2023 at 5:50 pm
I wish I could have teacher like him ! Fantastic!!
Васисуалий Лоханкин
April 21, 2023 at 6:13 pm
Complete nonsense. First, add a zero level and prove that time exists.
Misteribel
April 21, 2023 at 6:30 pm
That nine yo girl is sooooo smart for her age!! Love her enthusiasm. Most adults won’t even get what the prof was telling her! ❤
elusiveDEVIANT
April 21, 2023 at 7:03 pm
You wouldn’t need something very fast to travel to the future, just something incredibly dense. Find a black joke, loop around it a few times and come back.
Diego Fernandez
April 21, 2023 at 8:25 pm
Yes, really enjoyed it.
Young Troy
April 21, 2023 at 9:25 pm
Brian greene!!
Raja Faheem
April 22, 2023 at 2:12 am
Awesome
Shane Leaman
April 22, 2023 at 2:39 am
The fact that we are living out the long death of a moment of perfect order is blowing my mind.
Shidded n farded n peeded
April 22, 2023 at 3:56 am
So why couldn’t going through a worm hole just rewind you back to the point in which you entered the wormhole and then into the wormhole again and then eventually turn you into some sort of frozen object? Is that a possibility?
Sheldon Bailey
April 22, 2023 at 4:06 am
Is this an Onion video? Come on Brian, you can do better than pontificating to children, and undergraduates.
Sheldon Bailey
April 22, 2023 at 4:11 am
Entropy is not “order” or “disorder”, come on! STOP being angry.
Narain Karthic
April 22, 2023 at 5:26 am
We would like more mathematical explanations for theoretical physics
Gus Partschmuth
April 22, 2023 at 7:01 am
Happy to see that Freddie Mercury finally graduated and now is studying for his masters degree in physics.
overhaul
April 22, 2023 at 7:08 am
WTH!!!! That 9 yo is sooo smart for her age 😭😭😭
atabac
April 22, 2023 at 7:19 am
The grad student proves we could go back in time, he is einstein😂
Reyes M. Berrios
April 22, 2023 at 7:45 am
Brilliant!!!
Pete Venuti
April 22, 2023 at 8:14 am
I just want to know how the Higgs field slows down time..
World Wide Music
April 22, 2023 at 8:47 am
tbh the teenager part was the hardest to understand
Alpha Delta
April 22, 2023 at 8:57 am
Brian is so awesome
edawgrules
April 22, 2023 at 11:04 am
Wow, I really don’t remember how trig works. I was lost 8 minutes in.
Apocalypse Wow!
April 22, 2023 at 12:14 pm
I feel like level 3 was more difficult to understand mathematically and scientifically. 4 was easy enough because it was more of a philosophical discussion.
Amor_y_Alma
April 22, 2023 at 12:42 pm
I lost him at the teenager level and I have a PhD 😂😂 I guess Physics really just isn’t my field 😂
Mo Dar
April 22, 2023 at 3:21 pm
I m more inclined towards time being a man made construct rather than a fundamental property of reality.
Jared Sessi
April 22, 2023 at 3:35 pm
I could physically see question marks coming out of that teenagers head…..
gal shaharabani
April 22, 2023 at 3:56 pm
you lost me at level 2
Joshua Goracio
April 22, 2023 at 4:18 pm
So in principle time travel cannot exist to the past until the 1st time machine achieves it and even then you can only go back as far as when it was first created, but what if an ancient alien race in our past achieved time travel to the past 100 million years ago? Is this principle tied to the machine itself or the achievement of the event?
Dope-Lush
April 22, 2023 at 4:57 pm
I am fascinated with gravity and time and study on my free time. I’m going to change careers to pursue theoretical physics. God just watching this gives me so much purpose. Dr Greene’s passion is so overt and I love it. Brings tears.
Average-Guy
April 22, 2023 at 7:09 pm
I see Professor Greene, I click 😅😇
TheFreePantheist
April 22, 2023 at 7:22 pm
is it possible to hold completely still? Movement is relative
Dark Usta
April 22, 2023 at 7:23 pm
Time is the observed imprint of the rapidly chaging information of space. Like Einstein said, it is nothing but a stubborn illusion. Think nothing of time would be my advice. How can the concept of time have any real meaning, when everything is still happening at the same time everywhere? Technically the big is still banging.
Harrison Wofford
April 22, 2023 at 8:48 pm
Is that Jim Croce??
Masaharu Morimoto
April 23, 2023 at 12:31 am
Where’s this fella been!! I read his book like 15 years ago then he went back into the classroom to teach, Smoke the grass Tyson took over the public role lol.
Daniel Titterington
April 23, 2023 at 12:47 am
I’m Leo Pointing at TV when Brian was explains time in simplest terms
random
April 23, 2023 at 1:49 am
If time travel exists I would ask myself to come back to the past and prevent me to finish this comme
Sunny
April 23, 2023 at 3:30 am
Yeah, im on level 1
Sridhar Gajendran
April 23, 2023 at 4:37 am
With all due respect to Prof. Brian Greene, it seems he’s made an error at 6:49 and consequently got a wrong formula for time dilation.. Please correct me if I am wrong..
Alessandro Bonadies
April 23, 2023 at 4:10 pm
I noticed the same error! It should be L/D not D/L. Because D >L so D/L >1 but he just said that Ts is shorter than Tm meaning Ts/Tm < 1 !
Siddharth Jindal
April 23, 2023 at 5:15 am
wow. he started with spacetime and special relativity with the 9 year old
SerenityReceiver
April 23, 2023 at 5:25 am
I liked when the italian prof warmed up 🙂
Ravi Meena
April 23, 2023 at 8:06 am
It’s tuff
Ecal-Exal GLGL
April 23, 2023 at 8:16 am
please do more of this
i love it
P.
April 23, 2023 at 8:40 am
I’m not sure how I should feel about being best able to understand the concept of time at the level of a 9 y.o. as a grown adult human…
mrmotorbikez7
April 23, 2023 at 8:51 am
Brian Greene is fantastic
Flame Beats
April 23, 2023 at 10:02 am
As a 30 year old, he started losing me with the college student lol
Trung Hưng Nguyen Vu
April 23, 2023 at 10:13 am
That Grad. student looks just like Albert Einstein without grey hair and moustache
Anjali Bhatia
April 23, 2023 at 10:26 am
Suppose I were a photon. Then there would be no passage of time for me. Would the entire landscape of space and time be visible in the form of space alone?
Ryry Triplett
April 23, 2023 at 11:04 am
this guy talks too much, it feels like he’s a phony
Susmit Kumar
April 23, 2023 at 11:33 am
I gave up Science after intermediate because I never had a teacher like Professor Greene who would explain things…
All my teachers would just force me to mug up the formulae without understanding anything
Duser Miginte
April 23, 2023 at 11:54 am
Having real time conversations with a civilization light years away, sure. Just use the sub space transmitter… (Star Trek). 😅❤
Pady
April 23, 2023 at 4:22 pm
6:20 if that second clock moves the photon stays on its path ie it will not move to the right. Because the el-mg field is not moving
Jack Kenway
April 23, 2023 at 5:42 pm
So at the end he explained the concept to a PhD in physics?! I think not, more like they discussed that concept. Great video btw!
Brendan Beckett
April 23, 2023 at 7:14 pm
16:43 “what happened in the past and what happened in the future” Tell me you’re a determinist without saying you’re a determinist
Van sf
April 23, 2023 at 8:37 pm
The distinct difference between light field and gravitational, magnetic and electric fields is that light fields are attracted to, and absorbed or needed by all other forms of matter, instead of having pulling forces, or pushing forces, or both as the other fields
Thiago Fávero
April 23, 2023 at 8:58 pm
The second level is already undidactic 😅 for me, at least. Language barrier unhelps
Roc Ren
April 23, 2023 at 9:05 pm
06:17 I always find these kind of drawing needs a lot more explanation to be convincing:
Suppose the 2nd clock is not moving horizontally, but vertically, in the same direction of that beam of light. What would be expected to be shown is, the distance of the up going beam is longer, but the distance of the down going beam is shorter. I have not dive deep into this setting but I feel the difference for the 2 way distances would cancel each other out, and thus makes these kind of examples / drawings / explanations not valid.
ナルディス
April 23, 2023 at 9:17 pm
Dawg i thought i was ready for this video
Josh Hartman
April 23, 2023 at 9:18 pm
Jesus Christ I’ve been waiting for you to bring him in for years
Julian Ballard
April 24, 2023 at 4:32 am
Its all cherry picked mutts. This is so bad because it would be a lot better production video with pure Caucasian people rather than these things
Alex Windmill
April 24, 2023 at 5:53 am
I guess they couldn’t find a female black Brian Greene
Hot Clips Club
April 24, 2023 at 7:38 am
Ok, I need a lower level to understand it
Steadyman Casanova
April 24, 2023 at 7:45 am
There is so much interest in the Time dimension and very less enthusiasm on information, imagine a universe with space, energy, time and no information. @wired can we get someone to speak on information. information is in DNA, fundamental forces end everywhere else.
tutubeos
April 24, 2023 at 8:15 am
Wow
Tavor Benshahar
April 24, 2023 at 8:39 am
They should do a series where children explain things to adults in 5 levels, starting with really old people. Like what is tiktok or smnthg.
goldenduck
April 24, 2023 at 8:50 am
Transitions never fail to feel like Pokémon evolutions
Mahesh
April 24, 2023 at 10:09 am
Actually I’ need multiple views to understand even explanation to the kid.
Zooqan Pawar
April 24, 2023 at 10:34 am
i can listen to this man talk for hours
Mike Novelli
April 24, 2023 at 10:39 am
The “limit” is NOT the speed of light. We know that the instant the universe was created, the “big bang”, particles were traveling faster than the speed of light. We also know that the edges of the universe are expanding at a rate FASTER than the speed of light. Pretending light speed is the limit is an insult to science.
Sonic Egg
April 24, 2023 at 10:57 am
Level 1: says to innocent young child, so when it comes to time, we have relativistic time dilation…….
Umm Brian ? Audience is a kid…..
Fritz
April 24, 2023 at 11:06 am
One of the coolest physicists that I see on youtube is Brian Greene.
Hartadi Dev
April 24, 2023 at 11:07 am
I can only understand level 1 😂
N. Miller
April 24, 2023 at 11:50 am
I love any video that highlights just how dumb and ignorant I truly am. It helps to make me humble. I also love listening to scientists talk shop. It tickles my brain and makes me happy to know there are some very intelligent people here on Earth (as opposed to all those idiots on TV and on social media).
OnionPsi
April 24, 2023 at 12:08 pm
Are the “parallel realities” they are talking about @18:30 the same as the parallel realities in quantum physics?
Void Mayonnaise
April 24, 2023 at 1:17 pm
“The Big Bang must have been highly ordered, and we’ve been degrading through entropy ever since.”
My guy just described creation by God and the Fall of Man…
JD - Product Review
April 24, 2023 at 3:21 pm
💮💮 I simply love your video style truly refreshing and creative. 💮💮💮💮💮
Logen Ninefinger
April 24, 2023 at 4:02 pm
dont really like this kind of abbreviated conversation.
Mika Tarkela
April 24, 2023 at 4:28 pm
I got lost at 7:40 already lmao
Knowlege Point
April 24, 2023 at 4:32 pm
Brian Greene, I am Shahzad and just know that I like you, you are a brilliant man.
Dustin Hotard
April 24, 2023 at 4:35 pm
Clocks measure distance; time is a man-made construct.
DKFX1
April 24, 2023 at 6:14 pm
Until level 3 his presentation was packed with useful equations, mathematical insights into the structure of spacetime, but then his presentation took a nosedive into very abstract and less useful information. All his talk of entropy and compactified dimensions don’t belong in this talk and should be substituted with better conceptual dialogue centered on the mathematics and physics of time.
Maggie Z
April 24, 2023 at 7:09 pm
there’s a lot less fighting in this editor’s cut of everything everywhere all at once
Galactis
April 24, 2023 at 7:54 pm
Love me some Brian Greene. Guy is so excited, and so great at explaining.
Luis Fabricio
April 24, 2023 at 8:07 pm
And still don’t know what time is
Leul Damtew
April 25, 2023 at 3:02 pm
The first kid is so brilliant girl relative to her age
Jordan Morgan
April 25, 2023 at 3:32 pm
When I see Brian Greene I click
Jay White
April 25, 2023 at 3:35 pm
Very skilled in the Feynman technique
Steve McCrea
April 25, 2023 at 3:52 pm
Time is a measure of change (at the Plank length?) in our matter bubble (i.e. post big bang local universe)? So light speed freezes change?
eye emgae
April 25, 2023 at 4:08 pm
Brian is kinda smart🎉
Khushal Badhan
April 25, 2023 at 4:13 pm
2:30 traumatized the kid😂
Snow Arist
April 25, 2023 at 4:29 pm
If you watched TENET and The Expanse you would understand the PhD conversation…😄
Thomas De Quincey
April 25, 2023 at 4:43 pm
People love to quote MLK’s “the arc of history bends towards justice”. When, in fact, the arc of history ends up with us all dead. Destroyed by the very thing that allows us to live. Brian Greene is right, it is debilitating.
Ramiro Maza Personal Account
April 25, 2023 at 4:45 pm
This video is so professional and educative, love this content
Ivano Forgione
April 25, 2023 at 4:48 pm
The grad student looks like a young Albert Einstein while the expert looks like H P Lovecraft. MAKES SENSE!
Ramiro Maza Personal Account
April 25, 2023 at 4:51 pm
14:39 is the moment when he starts to blow my mind and give me a real headache
Ondro Baco
April 25, 2023 at 4:56 pm
what a load of BS! Just because you can swap numbers in a mathematical equation does not mean you can travel to something that exist only in your memory (past) or your imagination (future).
K A Nesiah
April 25, 2023 at 5:00 pm
The girl in the red sweater understands time better than all the others including the physicist
Nyandejje Franco
April 25, 2023 at 5:07 pm
To all those tht got left at the teenager level of discussion even if we’re purely adults now😂😂😂😂great discussions though.
a1d4a1m3
April 25, 2023 at 5:28 pm
We can’t travel to the past because we cannot unknown something.
a1d4a1m3
April 25, 2023 at 5:40 pm
Are we even really moving forward in time. Or do we just exist in a continuous flux now.
a1d4a1m3
April 25, 2023 at 5:39 pm
Question for Brian: How does the continuous here and now fit into the concept of Time? I haven’t heard any theories about the here and now.
a1d4a1m3
April 25, 2023 at 5:43 pm
Single perspective theory. Here now we only have absolute knowledge of the current existence of our own perspective experience.
greenspectrum
April 25, 2023 at 6:44 pm
I knew it. I’m 30 and still dumb
Star 42#
April 25, 2023 at 6:53 pm
we are still in the big Bang we must just catch up to ourselves.and there are cracks,
to overcome
Hugo Durou
April 25, 2023 at 7:06 pm
Every one of the people he explains to seems waaaaay more wise and competent than what I recall of myself and the other students in my university 😮
James Gary
April 25, 2023 at 7:08 pm
17:13 Wormholes & Time travel
James Gary
April 25, 2023 at 7:20 pm
24:55 Sending signals into the past.
ModernLit
April 25, 2023 at 7:25 pm
Brian Greene is one of those scientists who, like Sagan before him, do very well embracing the prosaic qualities of such weighted topics and I love it.
That his peer Porrati mentioned Vonnegut just made the video even more wonderful.
TheDefeatest
April 25, 2023 at 7:32 pm
So, Does tomorrow exist?
John Hamilton
April 25, 2023 at 7:35 pm
That explanation of the light clock to the teen was a bit advanced I thought unless she was maybe in her final year at school or even first year at uni. Btw… Is it me or did the 4th guy doing the research actually look like Einstein?
Jaren Whitehouse
April 25, 2023 at 7:43 pm
Does anyone know what I would google to learn more about that communication over arbitrarily large distances. I’m not familiar with what theory they’re referring to there.
The Clemens Experience
April 25, 2023 at 9:23 pm
I’ve got an idea about gravity “slowing” “time”.
M
April 26, 2023 at 2:59 am
26:07 Brian Greene meets Zizek 😂
Chem son
April 26, 2023 at 3:54 am
Level 1 Child
Level 2 Teen
Level 3 College Student
Level 4 Grad Student
Level 5 Expert
Level 6 Time Traveler
Chem son
April 26, 2023 at 4:10 am
Please do this.
Podcast Host Lex Fridman Explains Podcast in 5 Levels of Difficulty | WIRED
Level 1 Child
Level 2 Teen
Level 3 College Student
Level 4 Grad Student
Level 5 Joe Rogan
Man of Myth
April 26, 2023 at 4:45 am
These are some smart children/students they brought in. Very impressive! Well spoken individuals.
dacnum
April 26, 2023 at 6:25 am
What is entropy or disorder without a memory(a thought in the present) or a measurement(this is also just the present where we give concept to it and relate it to the “past” that our brains create) and what we call the present to contrast those against. There is no past or future.. and what one might think is that it leaves only the present but without the idea of past and future in relation to the present, the idea of the present also loses its meaning.. all time is abolished.
Andreas Fleury
April 26, 2023 at 8:33 am
I love it!
But do teenagers really do the kind of math in schools?
Vasco Santos
April 26, 2023 at 8:46 am
Loved seeing Pablo Escobar 16:17
kpw84u2
April 26, 2023 at 9:03 am
Funny he conned the 9 yr old into thinking she could sit perfectly still… typical Capitalist method of exploitation is to control the minds of its customers. 🤷🏽♂️
Norman of the Tempest
April 26, 2023 at 9:17 am
The teenage level was waaaay above my level lol. Sorry Ms. Jay. I forgot all of that stuff you tried to teach me.
Jerry Garziola
April 26, 2023 at 10:07 am
Theoretically he is a physicist…
sin
April 26, 2023 at 10:42 am
I first saw Dr. Greene in JRE podcast. His way of explaining things that seems so complex is unmatched. I’ve been a fan of his interviews and podcasts ever since.
Huy Nguyễn Quang
April 26, 2023 at 10:52 am
time stamp please
Sami Lindgren
April 26, 2023 at 11:13 am
Eternity lies ahead of us, and behind. Have you drunk your fill?
Jono C-D
April 26, 2023 at 11:36 am
Why is level 4&5 the straight white men?
Patrick Joyner
April 26, 2023 at 11:54 am
Time fascinating stuff, if there is an afterlife, it’s at the top of my list to ask aboit
Sunil Gaitonde
April 26, 2023 at 1:47 pm
If we travel Through a wormhole to the past then will it not be violating the law of conservation of mass? Because the particles which make you are already existing in the past and your reaching the past doubles the number of the particles which make you. Am I making sense? Matter cannot be created or destroyed. The sum of matter and energy should be same in the universe. Maybe we go back in time as virtual particle combination
Krzysztof Ciuba
April 26, 2023 at 2:49 pm
This (devilish) Akademia is…dumb, enough at 2:18- The Akademia Liar (i.e. o f Satan) fools a…poor kid on A.Einstein@the time parameter or the famous P.Langevin’s hoax in AD 1911 called the “Twin paradox”. What a moron…Society as in the Jesus time -Luke 7:32 (adults are dumb like their…children!).Hey…kids@Your TEacher, answer Q: are U at the rest reference frame or the moving reference frame?
Emerald Aly
April 26, 2023 at 3:08 pm
I was *totally* lost in the “teenager” explanation but bits and pieces with the adults made total sense to me
Jonathan Langdale
April 26, 2023 at 4:09 pm
Humans are consumed with time because we have so little of it. But waiting a long time to see disorder go to order isn’t really a big deal to a creature or reality that doesn’t care about monitoring deep time. Human ego is still in our way.
Peter Awad
April 26, 2023 at 4:14 pm
I have 2 master’s degrees (psychology) and was completely lost with the level 2 math. Love Brian Greene though!
dnjoncvichy
April 26, 2023 at 5:07 pm
explaining that to teenager is way too deep.. once a while talking normal language doesn´t make it.. like Einstein said you should explain it for 7 years old kid..
Vincent Xu
April 26, 2023 at 5:07 pm
Level 4: Einstein reincarnated
Ghostreams Live
April 26, 2023 at 5:29 pm
Yes! To whatever he is discussing with the expert😶
Bo Maathuis
April 26, 2023 at 5:47 pm
I did not know Pablo Escobar is studying physics.
Sydney Fishman
April 26, 2023 at 7:51 pm
“We walk around with general relativity in our pockets” – what a great quote!
Patrick Kilduff
April 27, 2023 at 1:27 am
One question I always have is, we know there is a limit to speed (see c), and we know you simply cannot exceed this speed since it is inexorably linked with time. But what is the limit to time? As in, what is the fastest time can tick? Are we experiencing time at its ‘fastest’ on Earth? Or does all our motion around the solar system, local group, galaxy, etc. have a relativistic effect on the time we experience?
Robin Robyn
April 27, 2023 at 1:49 am
The ancient Greek Philosopher Aristotle stated that Time is relative to change, caused by Motion. Aristotle said that there can be no ” Time” without change .
Claudio Cimarelli
April 27, 2023 at 2:15 am
When he used miles for the speed of light, he lost all the credibility in my eyes 😂 (partially a joke😅)
Nomad Explorer
April 27, 2023 at 6:17 am
The whole universe and the laws of governance is the Cause & Effect, and Spacetime Continuum is embedded in this. Macrocosm and the Microcosm are the layers blossoming, withering and spreading in entropy’s clutch.
Todd Rothman
April 27, 2023 at 8:25 am
This is a fantastic video. Love it
Nino Rodriguez
April 27, 2023 at 9:11 am
That accelerated quickly
Dem Nisbet
April 27, 2023 at 9:30 am
The reason for the arrow of time is that time is caused by an oscillation backwards and forwards. Then the time-antisymmetric components cancel, and the time symmetric components amplify, which is why the laws of physics are time symmetric. Reversing time does nothing, because time (as we know it) is already a synthesis of forwards and backwards time. Think of it as a palindrome that you write by starting at the centre, and copying everything on either side. That’s why it’s always necessarily going to be palindromic.
Dem Nisbet
April 27, 2023 at 9:59 am
college kid comes across as freakin smart
Ajit Antony
April 27, 2023 at 10:00 am
nice
Sage Exploit
April 27, 2023 at 11:15 am
Articulation !!!! 🤯🤯
Aravind C
April 27, 2023 at 1:34 pm
Thinking of this ., How does our body age ?
Do we have a body clock that will make us age even if we travel at a speed of light indefinitely.
Won’t we feel hungry or do we have indefinite energy even when we drive that space craft in speed of light?!
Or is the opposite true ?
Neerkoli
April 27, 2023 at 1:34 pm
24:47 which theory/paper is he talking about here?
Oswaldo Garcia
April 27, 2023 at 2:12 pm
Are there more than one Arrows of Time? If so, do they point in the same direction? Lastly, what purpose do each serve?
eduradbah
April 27, 2023 at 4:24 pm
do we really need to travel to the past if just by looking at stars we are already looking at the past? The fact of existence in our current position is the past of everything else around us. To physically live the past we should contemplate the idea of using light to recreate matter (collect as much light as possible and make the photos real). Btw, time is change in reference to other changes.
mysticery
April 27, 2023 at 4:46 pm
Anyone know what shoes Brian greene’s wearing?
Danny Ferrell
April 27, 2023 at 5:45 pm
Anyone else confused at the high school level? Just me? Okay.
Diogo Carlos
April 27, 2023 at 6:29 pm
Guys, I´m probably being dumb, but as he explained to the grad student there’s prefered frames of reference given any case. What’s the most prefered frame of reference? Is it the center, where all begun? 😅
Gym Hayes
April 27, 2023 at 6:38 pm
Why are you using imperial and not metric the new generation deserves to learn the system the whole science community uses.
Ilyas Elouchihi
April 27, 2023 at 7:10 pm
I’m a dumdum in physics, but this guy knows how to explain amd simplify things, he’s just so awesome.
Rami Emad
April 27, 2023 at 7:13 pm
The 9 years old girl was so smart and cute 🥰 and I am really impressed by the simplicity yet the depth of the explanation.
A Knight of Islamic Arabia
April 27, 2023 at 7:22 pm
What a wonderful Italian accent the professor at the end has.
Isacco Sampaolo
April 27, 2023 at 7:29 pm
Kurt Vonnegut, you always will be missed… (nice video btw)
Ender Sender
April 27, 2023 at 7:31 pm
Teen be like
“Nod like you know what the heck he’s writing”
lezamac6
April 27, 2023 at 8:07 pm
I did not know borrat was a grad student
Neopheus
April 27, 2023 at 8:49 pm
Literally a load of horseshit!!!! Humans have been programmed to believe time is a fixed constant…..and it sure in the fawk isn’t…..y’all some dumbass humans!!!!🤣🤣🤣🤣🤣🤣
Joseph Oduor
April 28, 2023 at 5:05 am
Something about the lively hand gestures makes his explanations much more enticing.
Between 2Spaces
April 28, 2023 at 5:56 am
This video didn’t age well. Isn’t the space expanding theory now proven false with the observation of objects that couldn’t exist at the age we are observing them at?
ExtravagantPanda
April 28, 2023 at 11:18 am
No, it hasn’t been proven false. That’s a false claim made by religious fundamentalists and pseudoscience peddlers who want to discredit the big bang theory to push their own agenda.
Adrian Pochec
April 28, 2023 at 7:38 am
It would be cool to see a philosopher explaining a concept episode!
Slicey K
April 28, 2023 at 8:16 am
I understood everything except teenager… lol
Robin Hodson
April 28, 2023 at 8:38 am
I had to wait (actually, I skipped through) right until the end, to begin getting somewhere. So maybe we can’t violate causality, because causality violates us instead. But does causality exist at all? Why would it? The only evidence we have, is our memories of the past, and the fleeting present moment.
A minute ago we could’ve been octopi, and a minute in the future we could be waterfalls: We wouldn’t know any different. Our memories would change as the world does/did/will.
The Beast
April 28, 2023 at 9:44 am
I’m probably wrong but at 6:34, shouldn’t the ratio be Tm/Ts=D/L?
Maddolis
April 28, 2023 at 10:38 am
It seems one’s brilliance in physics is directly proportional to the flamboyance of their socks.
Sir Annikus
April 28, 2023 at 11:13 am
The one thing I know about it is we don’t have much of it. Enjoy life!
JungleLarry
April 28, 2023 at 11:24 am
There is significance in the passage of time of the significance of the passage of time. The significance of the passage of time is significant, to the passage of time
Mahesh Janjal
April 28, 2023 at 12:05 pm
Technically this is 30 min video…but for me it was only 1min
Mondo P
April 28, 2023 at 12:44 pm
I literally have zero idea once the maths starts- i cannot understand the maths the second child was being shown…
Mondo P
April 28, 2023 at 12:47 pm
That 3rd student wouldve been loving this meeting
adarsh pandey
April 28, 2023 at 1:40 pm
Wow
kassimg12
April 28, 2023 at 1:42 pm
The grad student looks like a Albert Einstein.
SoCloseToToast
April 28, 2023 at 2:10 pm
I felt like a kid watching this guy explain things. learned a lot in a short amount of “time” Well Done!
Mike
April 28, 2023 at 2:39 pm
What a dream. Blackboard time with someone like Dr Greene
asymptoticspatula
April 28, 2023 at 2:47 pm
“It might be a brief flicker on a single moat of dust floating in a cosmic eternity. But it’s everything.” Such a great way to put it.
Professor Choy
April 28, 2023 at 2:53 pm
I am amazed by how well he did this, wow. Can I keep this video forever, YouTube, never delete this one.
R & R
April 28, 2023 at 4:28 pm
Can you say that time is emergent property of interaction? I mean that if there is a particle that never interacts with any of forces in the universe, would it experience time? If it doesn’t, then time for this particle would start with its first interaction with the universe, if yes then I am wrong 🙂
Chauncey Frend
April 28, 2023 at 4:30 pm
The last conversation sounded like they began discussing entanglement and emergent real-time quantum communications hypotheticals, but they never said “quantum entanglement” hmm?
Nathan Meyer
April 28, 2023 at 4:51 pm
The PhD discussion was 🔥
nightwish15
April 28, 2023 at 5:11 pm
You can see Brian Greene is a very nice man and a gentleman
Todd Meyer
April 28, 2023 at 6:28 pm
Morgan has his ideas and no one else matters. You did great!
Rami Emad
April 28, 2023 at 9:24 pm
9:50 … The correct answer is: We are already using time dilation equations in our mobile phones to time correct the timing of the signals of GPS Satellite which are moving at orbital speeds, in order to get the Uber or the pizza delivery to our exact location.
Sudipta Sarkar
April 28, 2023 at 11:14 pm
On lvl 2 how time of stationary clock and moving clock’s ratio be D upon L it should be L upon D cz t = distance upon velocity and as the velocity is constant so it should be directly proportional to the distance light covers na??
Bruce MacKenzie
April 28, 2023 at 11:26 pm
If space is infinite then really there is no time. Other than a construct.
Vercetti
April 29, 2023 at 1:13 am
Me: Let’s see if I can understand level 5 clearly
Also Me: Gives up at level 1
Kim Lundström / breather
April 29, 2023 at 4:24 am
That last guy looks like an Indiana Jones villain that works for Hitler on a “special project”, but he doesn’t do it because of ideological reasons, he has his own reasons which necessarily isn’t good or bad, just bold and mind blowing (but ultimately dangerous and fatal).
Pranjal Singh
April 29, 2023 at 4:50 am
Well that grad student is basically Einstein.
Randy McAllister
April 29, 2023 at 5:33 am
Can anybody explain to me why we’re always hearing about how space is expanding but never hear how time is expanding? I mean, if there truly is a thing called space/time then why would only space expand? It just seems to me that expanding time might explain why we have an arrow of time
SBTOPZZZ LG
April 29, 2023 at 5:38 am
I can’t believe Bob Odenkirk is a Theoretical Physicist
raihanshrk19
April 29, 2023 at 7:45 am
6 don’t forget you should include the motherfucking CHAT GPT LOL
Simon J Morley
April 29, 2023 at 7:57 am
Oh dear. Such utter, utter confusion. How does science get Time so wrong? Let me help you ‘nail it down’. Time is NOT complex. It is PROFOUNDLY SIMPLE. It can be explained / described in a paragraph. For some reason You, science, maths and philosophy just can’t see it. Hence the nonsense. Yet the evidence is ubiquitous.
We think we perceive time passing, we think we experience time passing; but look around you, we ACTUALLY SEE change happening, we ACTUALLY EXPERIENCE change happening (we age because of complex bio-chemical change). Quintillions of change events happening all around us. Undeniable ubiquitous, profoundly simple evidence (note: motion, i.e. changing spatial position, being a subset of change).
We don’t ‘move’ in time, we CHANGE in time. We move in space because ‘movement’ is a spatial reference!! Time is NOT a spatial dimension!
And change is reference frame specific. There is no universal, absolute, single, ill-defined, Time ‘thing’. No evidence of it whatsoever.
The ONLY evidence of ‘time passing’ is Change-events / change-series happening. Academic rule no.1 look at the evidence. This evidence is overwhelming, ubiquitous and profoundly simple. The Universe expands, the Earth spins, tides turn, life breathes, atoms vibrate, photons flash etc etc. All change events, change series. Everywhere. Ubiquitous, undeniable change.
Then define your terms. Academic rule no. two. The word time has TWO distinct core uses (and you NEVER differentiate), both reference the underlying reality of Change, and both are abstract:-
a. The collective ‘flow’ of change-events. A collective noun. Like Traffic is the non-specific collection of cars, Time is the non-specific collection of change events happening. Evidenced all around us. The ‘River’ or ‘flow’ of Time’ is actually the ‘river’ or ‘flow’ of quintillions of change-events happening. This is undeniable, surely
b. We calibrate change rate using Time (‘per hour’) and we index change-events using Time (dates, clocks etc). Time is evidentially a mental framework (i.e. Dimension) for calibrating and indexing change (events and rate). Also undeniable.
The word Time has two distinct meanings…you never differentiate them, hence your confusion. Both are abstract, and both reference the underlying reality of change and change-events. Time is abstract, change is real. Change includes the subset of changing spatial position i.e. motion.
There is NO evidence that Time is real. NONE. Collective nouns and mental models/dimensions are abstracts.
It matters because you think of Time as a universal, singular, ill-defined ‘thing’ – despite there being NO evidence for it (other than change happening).
It is not. Change (events) are the fundamental. And change is NOT universal, it is REFERENCE-FRAME SPECIFIC. Not one universal arrow of Time, but quintillions of ARROWS OF CHANGE. Isolated quantum change-events can be ‘time reversible’…but multiple sequentially dependent, unsynchronised converging change streams aren’t (hence you can’t unscramble an egg). Nothing to do with properties of Time. All to do with properties of Change.
So, Time, one word, two distinct definitions, both abstract, both reference the reality of change and change-events. And all change is caused by energy differential. Time causes nothing…it is nothing. Simple.
And by the way, take Space (the dimension of relative spatial position, i.e. the xyz-axis) and merge with Time (the dimension of change) and you get Spacetime – the dimension of changing spatial position aka motion
I hope this helps http://www.time-defined.com
Tony Trott
April 29, 2023 at 9:00 am
time does not exist. Show me time on the periodic table of elements. What humans call time is just a measurement of speed based on one of the following. the Earths rotation or Orbit, the speed of light or the atomic decomposition of an atom. Time is just an abstract concept of the human mind. In reality it does not exist.
Temirlan
April 29, 2023 at 9:51 am
I like socks of an expert and Brian Greene 😂
Muse Inglis
April 29, 2023 at 11:20 am
The grad student (4th person), is totally sporting the ‘Einstein’ look!!! Hair & stash! …he just needs some glasses!
😂
Dan
April 29, 2023 at 11:52 am
The bro lost me at high school level.
I guess I should have paid more attention in HS😅
Ivan Štrbac
April 29, 2023 at 12:38 pm
Absolutely brilliant! The emotions when explaining and how the “students” listen with “gimme me more” is incredible. I wish. I’ve had such Professor in my time.
Professor Green is exceptional human being!
Enang Uko
April 29, 2023 at 12:55 pm
Thanks Brian.. I listened through as it was interesting
Piter Makul
April 29, 2023 at 1:31 pm
I apologize for perhaps silly question but if there was nothing (no particles, matter etc.) will time still exist in nothingness?
paulo neto
April 29, 2023 at 1:34 pm
Poor materialists…
Shital Raj Deuja
April 29, 2023 at 1:55 pm
To you or to them. 😂😂😂😂😂
Mike Mondano
April 29, 2023 at 4:07 pm
His concepts of time are very simplistic and mostly obsolete. He never really looked into the subject.
FunkMasterHexByte
April 29, 2023 at 5:33 pm
10:21 “there’s no mathematical distinction in the laws between forward in time and backward in time”
what about complex numbers?
Aggressively Loving
April 29, 2023 at 6:16 pm
I just love this mans passion! Also I didn’t know the fun fact that the speed of light can be described as “fast enough to go around the entire earth seven times in just one second”! Very cool!
Andrew Strelecky
April 29, 2023 at 6:37 pm
“Hey little girl would go out into space and go back and have all your friends be dead? Would you like that?”
mixuaquela123
April 29, 2023 at 7:41 pm
Am I wrong thinking that time is just a man-made mathematical construct to handle motion? Without motiom there wouldnt be time?
WaightZer
April 29, 2023 at 9:03 pm
you could cast that grad student as mario.
CS
April 29, 2023 at 11:17 pm
She took physics as a freshman in high school 😳
Daniel Jakubik
April 30, 2023 at 12:45 am
The children chosen are obviously above average students in science. As we progress to older students and established physicists, the discussion becomes more advanced and more fascinating.
vinzent1992
April 30, 2023 at 1:49 am
That graduate student looks exactly like Einstein did when he was his age, the hair, the mustache, everything fits perfectly! :P.
Lucht S
April 30, 2023 at 5:43 am
“Ok Brian, cater this one to a small child”
Brian: “EVERYONE YOU KNOW WOULD BE DEAD!”
system2
April 30, 2023 at 6:05 am
The second explanation was brilliant up to the point the maths came jn, then maths was used to explain maths, and that’s when understanding gets complicated.
Amere Mortal
April 30, 2023 at 6:08 am
The speed of light is the speed of causality. The speed of cause and effect. It is the speed at which we can process information. Like a computer…
ivy_savage
April 30, 2023 at 6:31 am
Great video, Until the end of Time is a great book by Greene and worth the read If your into this kinda stuff
Clubber
April 30, 2023 at 8:52 am
Still not clear why is time, perceived as just a dimension but assumed here as a physical entity for calculations, is being associated with human ageing which is a natural phenomenon. Time doesn’t extend the lifespan of human cells, does it?
Dr John Pollard
April 30, 2023 at 10:22 am
Why theoretical physicists have no clue.
hari babu
April 30, 2023 at 10:54 am
Wow i wasnt expecting lvl 1 itself would be that much
TheDarkGlove
April 30, 2023 at 11:24 am
I’m 45 and TIL I’m actually 8
Johnson Mafoko
April 30, 2023 at 1:02 pm
amazing video by Mr Green
Jeffrose662000
April 30, 2023 at 2:03 pm
I’ve been listening for 25 minutes and 20 seconds and I’ve heard a bunch of theories I’ve heard a bunch of equations I’ve heard Einstein‘s name mentioned multiple times not once have I heard you mention the creator the Father the Son and the Holy Spirit. Oh wait I should just believe the Science which is man’s best guesses also known as theories. Mr. Greene you wouldn’t happen to be Jewish would you?
Vivada
April 30, 2023 at 2:20 pm
JEFF ROSE for PRESIDENT !!! As-salaam ‘alykum🙏🕊️
Wood Croft Ⓥ
April 30, 2023 at 2:11 pm
21:11 Sean Carroll in his texbook on General Relativity poses this question as an exercise and doesn’t give an answer. Such a jerk move.
Anthony Smith
April 30, 2023 at 2:34 pm
“Time moves slower when you’re in motion” That’s my takeaway today!
steve shephard
April 30, 2023 at 3:27 pm
I take comfort that I understood the explanation to the 9yr old. After which my brain began to eat itself.
alireza daneshfar
April 30, 2023 at 4:28 pm
😁😀🙂🤔😰
TheGhostcowvaca
April 30, 2023 at 4:50 pm
Wrong. There is no time.
nasarin kamsiri
April 30, 2023 at 5:06 pm
❤❤
Mr. Simplicity And The Simplicity Lifestyle
April 30, 2023 at 5:21 pm
Is that general relativity in your pocket or are you just…
Mystic Wine
April 30, 2023 at 11:16 pm
If there is such a thing as time, why is it always the Present?
ssshonnn
May 1, 2023 at 12:46 am
What einstein and anyone else has figured out, is if we on earth, are 1:1 with time or maybe 1:2 or more or less
Tone McKoy
May 1, 2023 at 2:07 am
Anybody else not get past the elementary level?
john hartman
May 1, 2023 at 4:50 am
Works if time ACTUALLY exists, but there is NOTHING outside of your brain. Math uses it as a sequence marker, and that don’t make it a real dimension. THINK: Dimensions 1 and 2 don’t exist on their own without math, so what are you doing? It is a belief system, and this guy is sensationalizing the paradigm to make it harder to see the problem. He’s not looking for problems.
channyngtatum
May 1, 2023 at 5:33 am
Now deadlift 3 plates.
EyesOfByes
May 1, 2023 at 7:21 am
*No Time For Caution*
EyesOfByes
May 1, 2023 at 7:57 am
15:30 Yeah that little manouver almost cost them 57 years
Chris Stevens
May 1, 2023 at 8:06 am
Load of 💩
Moises Huerta
May 1, 2023 at 8:53 am
Doesn’t space travel faster than light?
Aktan Akhmetov
May 1, 2023 at 9:22 am
So Pablo Escobar invested heavily in physics, found a way to travel back in time to get young and skinny, and then travelled forward in time to become a graduate student of astrophysics.
Ironicist
May 1, 2023 at 10:57 am
Kid: Einstein has wacky hair.
Grad: *walks in*
Kid: Einstein!
Mack Menezes
May 1, 2023 at 11:25 am
You can aligned the parallel timelines together ,but you have to find the correct interpretations of all the psychedelics around u, It isn’t a time travel but a parallel world interpreter
Mack Menezes
May 1, 2023 at 11:30 am
It lies in cryptograph and mutimedia
Rodney Edens
May 1, 2023 at 1:14 pm
He could have explained to the high school student that these formulas are already being used with GPS. Time dilation has to be factored in. If it wasn’t, the accuracy would become worse and worse. Since the satellites are moving at a significantly higher speed than the ground units, the clocks on the satellites are programmed to measure time more at a slower pace so that they can stay in unison with ground receivers. If they weren’t set to factor the difference in, then each day GPS measurements would grow less accurate, as the difference between the ground clocks and the orbiting clocks increased.
*** I see he got to it with the college student.
Dheeraj Gujrathi
May 1, 2023 at 1:29 pm
suppose every living being cannot age,how will I percieve difference in time at higher speeds and lower speeds then?
Panos Katsoulis
May 1, 2023 at 2:29 pm
grad student is like a young Einstein
Lakshmanan Sivakumar
May 1, 2023 at 3:17 pm
Neil deGrasse Tyson, I think I need your help here!
sb6
May 1, 2023 at 4:41 pm
Stay in school folks. 😉
Jay MCC
May 1, 2023 at 5:03 pm
excellent 🎉🎉🎉🎉🎉🎉😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊🎉🎉🎉🎉😊more vids like this please educational levels up 🚀🚀🚀🚀🚀🚀🚀🚀🚀 1:21
Simionius775
May 1, 2023 at 7:59 pm
Time is happening right now…
David
May 1, 2023 at 8:32 pm
Love the socks of the experts
KJ Wong
May 1, 2023 at 10:49 pm
So at the age of 40, I basically have an understanding of time and physics of a 14 yr old 🙁
Lukionest
May 1, 2023 at 11:08 pm
I don’t buy Dr. Greene’s explanation at 22:00 that to a moving observer the two beams of light will not hit them at the same time in the donut universe. I believe that in Brian’s “non-moving” frame of reference, he would observe that the two beams don’t hit the moving observer at the same time, but the moving observer would be justified in declaring his frame of reference to be non-moving and he would experience both beams of light hitting himself at the same time. He would think Brian is the one who is in motion. Neither one of them can point to the edges of the donut and say, “See, I’m not moving with respect to that edge, so I’m really the stationary one.” Both would of them would each measure the speed of light as the constant “c”. Therefore, there is no preferred frame of reference, nor does it make sense to declare everyone’s motion except Brian’s as being “real” motion. Real with respect to what? I see nothing in the description that makes Brian’s frame of reference as special and non-moving.
Alantheus Thompson
May 1, 2023 at 11:43 pm
Ive always thought of time as a gumball machine.
Kallian Publico
May 2, 2023 at 1:42 am
The coherence of an idea only makes sense insofar as it resonates where you are present. Where or when you are present and it does not resonate the idea breaks down: its coherency is questioned.
Coherency can never be objective. Because no theory is both necessary and sufficient. Only consciousness is ever objective. Theory is subjective. Time was never a “thing in itself” as all conscious things are. Time is a “relationship”. A relationship between consciousness and ignorance. “Its” coherency changes with experience. That change is held together only by prior expectation. Once something unexpected happens: once experience contradicts expectation, time is dismissed or re-evaluated.
Mevin Mathew
May 2, 2023 at 2:02 am
After this video..my iq grew by 24 points
liamarnold94
May 2, 2023 at 3:31 am
The Grad student donut-lazer experiment. What happens if you move left at a steady pace and at the same time, one of my triplets fires off left along the circle plain of the donut universe at 99% the speed of light and the last of my triplet sibling fires off right under the same conditions. When we meet again, who is older/younger?
simon young
May 2, 2023 at 5:07 am
Did he get the Ts/Td ratio upside down? Great video, highly educational series.
Arvin Paunil
May 2, 2023 at 6:22 am
Therefore my brain is as innocent as a child
narco73
May 2, 2023 at 7:00 am
To be honest, i don’t think any of these levels was an explanation of time. Probably because there really isn’t a known explanation. But it was a nice way to pass 30 minutes in my reference frame 🙂
charles iphone
May 2, 2023 at 7:12 am
Honestly, the first kid explanation was not very good lol
Eric Yeojiajie
May 2, 2023 at 7:43 am
For the teen part, when Brian do the ratio, can someone help me to understand the ratio part? Cause to me it seems like it should be L/d. Thanks!
Oluwasemilogo Balogun
May 2, 2023 at 10:22 am
With Einstein’s special theory of relativity, I think time will be seen beyond as a scalar quantity and time may be given a whole different unit
HalfLucan
May 2, 2023 at 10:47 am
What do we want?
TIME TRAVEL!
When do we want it?
ITS IRRELEVANT!
Juha J.
May 2, 2023 at 10:58 am
I love this as a pragmatist and even a humanist. So I have slight idea what was talked about.
Brilliant display of our most important resource, time.
Mauricio Gonzalez Gil
May 2, 2023 at 1:03 pm
Just beautiful 😊
ssgdhg sdfff
May 2, 2023 at 1:11 pm
Very interesting. However, this video confirms that I am more a social science guy:p
Cadis Kurane
May 2, 2023 at 1:38 pm
Okay wait i have a question. If i am in a spaceship moving faster than speed of light the fuel indicator in my spaceship should remain still by that logic because light can’t reach it. But my fiel is still burning alright? Since my fiel is burning even if I’m faster than light that would mean change in fuel quantity is unrelated to the speed of light. And since that’s the case, can i say that time isn’t uniform and light speeds up change(time). Can i also say that time is irrelative to light and since humans only have concept of time in presence of light the change on earth they’ve observed is affected by light. Can i also then say that time is different for objects and humans? Or can i say that time outside of light let’s say universal time is different than time observed inside of light?
Robert Miller
May 2, 2023 at 3:17 pm
Great video!
Justin Green
May 2, 2023 at 3:41 pm
The only thing he should have emphasised in the time clock derivation is the assumption that light is the same speed no matter how fast the reference frame is moving. That is assumed by the wave equation that appears in Maxwell’s equation. For years after Maxwell’s equations, scientists assumed the wave travelled in a medium called ether. Scientists tried in many ways to detect the change in speed of light by changing the direction of light measurements given that we are in a reference frame traveling through space. However, scientists found that no matter that the Earth is hurling through space, the speed of light is measured the same speed in every direction. So the best conclusion is that the speed of light is constant no matter the speed of the light source. That’s essential to state and explain in the derivation. Einstein was bold enough to imagine and claim that space and/or time must be changing to explain this odd behavior of a (light) wave. All other known waves (except gravitational waves which were measured in 2015) have a medium where the speed of the wave depends on the speed of the medium it passes through. That was a bold move in his time. I’m sure it sounded preposterous to most scientists of the day.
Bruce Lee
May 2, 2023 at 4:26 pm
Big bang vs inflation?
EchoCT
May 2, 2023 at 7:53 pm
I had 2-3 little “oh….. ” moments during the college level explanation. I love the theoretical side I’ve just never been able to put the math to it.
I love that this actually made sense.
Asep Haekal
May 2, 2023 at 8:12 pm
Now I understand why PhD is Doc·tor of Phi·los·o·phy
black swan
May 2, 2023 at 10:17 pm
Once they get to the college dude my mind exploded I didn’t understand a word I was barely keeping up with highschool chick
Mike McKelvey
May 2, 2023 at 11:18 pm
This video is a banger
Asif Shaik
May 2, 2023 at 11:58 pm
I think the last level was soo philosophical.
Jade30
May 3, 2023 at 12:21 am
He lost me at the teen explanation 😒😑
Hexum944
May 3, 2023 at 1:46 am
What’s up with the dude at 11:00 wearing earrings?
Jason C.
May 3, 2023 at 3:43 am
Amazing!
GRiM
May 3, 2023 at 5:17 am
My brain left me when he started drawing 20 letters and lines on the board and I was simply not able to follow anymore. Explains why I hated physics class.
Jay Cho
May 3, 2023 at 5:34 am
He should’ve done with a successful business man, a homeless, and a monk. That would’ve been interesting to see.
Jay Cho
May 3, 2023 at 5:43 am
The grad student looks like Einstein 😂
Jay Cho
May 3, 2023 at 5:54 am
I wanted to see him give the “kid” version of the lecture to the professor at the end. 😂
Aaron Internet
May 3, 2023 at 6:13 am
would love to see david deutsch on here explaining quantum computing
oonaofsauceland
May 3, 2023 at 9:27 am
I started not understanding at the 9 year old so I stopped. I am 35.
Fixedguitar
May 3, 2023 at 10:10 am
Later this summer I’m going back to 1998 for a few hours. It’s fun at first but when you realize you can’t stay it’s hurts.
Senku Yagami
May 3, 2023 at 12:13 pm
if we just travel more slowly than earth
then will we go back to the past
A B
May 3, 2023 at 12:49 pm
He lost me on teen lvl……
stephen blessed
May 3, 2023 at 1:30 pm
Time doesn’t exist. Humans invented it. Prove me wrong.
Vishva Kumara
May 3, 2023 at 2:36 pm
Actually the GPS satellites doesn’t take STR/GTR into account. US Air Force synchronizes those to correct for the time-dialation periodically.
Cpasa •
May 3, 2023 at 2:59 pm
The moment that Einstein showed that time happens different depending of velocity and gravety, the concept of time itself don’t have much sense anymore. Humans invented time with the only purpose to have a imaginary measurement that it supposed to be the same for every everywhere, when that statement is no longer true there is no need to have time anymore
DeepFriedLiver
May 3, 2023 at 3:47 pm
He lost me halfway through the conversation with the 9 year old 🤷♂️
Matze Klingner
May 3, 2023 at 4:00 pm
I didn´t know Craig Ferguson was a Professor of physics…
imrshn
May 3, 2023 at 4:05 pm
0:27 Child [Level 1: Kayla Martini]
4:05 Teen [Level 2: Maria Guseva]
10:09 College Student [Level 3: Zain Kamal]
16:16 Grad Student [Level 4: Alexander Novara]
23:56 Expert [Level 5: Massimo Porrati, PhD]
faburisu
May 3, 2023 at 5:34 pm
Well i’m not even level 2, ok, time to bed.
Mark Campbell
May 3, 2023 at 5:51 pm
What is the variation of star content that is acceptable today??
Warren & Amanda Hyde
May 3, 2023 at 5:54 pm
The teenager asked a very insightful question about whether we in our lifetimes will make use of the theory of relativity in our daily lives, the answer being “yes” already.
Adrian Riebel Brummer
May 3, 2023 at 8:35 pm
I’ve seen till the second girl. Both seem to have IQs over 130
Ethan
May 3, 2023 at 9:37 pm
@Alexander Novara, we lived on the same floor in Nordenberg Hall freshman year! I’m glad to see you’re doing well academically and I’m super jealous you got to meet Brian Greene! PS – I love the stache
Alexander Novara
May 3, 2023 at 10:09 pm
Hey Ethan, thanks so much for the kind words, I hope you’re doing well yourself! Fond memories!
David
May 3, 2023 at 11:28 pm
It’s a construct. Einstein was a joker. E=MC squared is immeasurable because you cannot measure C.
Killua2001
May 4, 2023 at 12:00 am
So what were Michelson and Morley trying to do? Cause that was, ya know, before Einstein. And for that matter, how did Minkowski come up with those same equations (at least, the real ones involving time dilation rather than some banal e=mc^2 that barely appears anywhere) well before Einstein?
One last question… why is 1/sqrt(ε_0 μ_0) a constant? Why does that quantity just naturally appear in Maxwell’s equations? I don’t need to be Einstein to derive it. I need to be just slightly more educated than the teen Brian is talking to.
But I’m sure you’ve got all the answers, you appear to be an expert after all.
Domenico Palomba
May 4, 2023 at 12:19 am
The face of the little cute kid pays all the years of deep studies that Mr. Greene put into this. Transferring knowledge at such level is pure art.
Aaron Russman
May 4, 2023 at 12:21 am
Every day we should try to educate our kids about everything. We can give them knowledge, teach them the fundamentals of life, common sense and guidance then we will create a strong education for our kids
Lou Pasternak
May 4, 2023 at 1:41 am
waiting for a glass to unsmash?
Lou Pasternak
May 4, 2023 at 1:47 am
Is there parallel universe where……..Trump 1 ?
w23857980
May 4, 2023 at 2:16 am
Time flies when watching this.
Kimo Bruddah
May 4, 2023 at 3:21 am
OK, first, space is moving, you told her she could sit perfectly still in space, but not time.
Since space is expanding, its moving.
In fact, everything is moving.
I would argue that time is not moving, but everything else is, the opposite of what you said.
We are time travelers.
Kimo Bruddah
May 4, 2023 at 3:32 am
Second, the speed of light is a speed limit for someone without foresight.
One day, we will be able to relocate so quickly, light will stand still.
Kimo Bruddah
May 4, 2023 at 3:47 am
Third, saying that everything after the big bang is degradation is a form of observation, another way would be that the big bang started the evolution of all things in our observable universe, where all things form and reform over time, constantly rearranging their particles of matter, and not degrading, but rather transforming.
Kimo Bruddah
May 4, 2023 at 3:54 am
Wormholes….is all speculation.
What most people call wormholes are just pathways through the fabric of spacetime.
There is no ‘hole’.
And suggesting that time is different at either end, or that you need immense power to keep them open is an opinion.
Mark Mathis IV
May 4, 2023 at 4:19 am
Time is a man made construct, created to measure erosion and decay. Our race is less than the bat of an eyelash to the Sun, or the universe. When the last human dies, so will this idea.
Mungelo Mwaanga Sikateyo
May 4, 2023 at 5:15 am
It is like at younger stages physics is an exact science. Then, as we mature and grow, we realise that our certainty in it becomes more of a profound discussion of reality and our place in it. Deep😅😅
HPRST
May 4, 2023 at 8:21 am
6:48 can someone tell me why is it D/L instead of L/D ??
Quiddam
May 4, 2023 at 9:20 am
I bet that grad student can’t wait to get some gray hairs
And The Funky Bunch
May 4, 2023 at 10:51 am
06:31
old awacs
May 4, 2023 at 1:38 pm
Does time have definable increments or is it absolutely continuous? Most care maybe about 1 second increments, me as an electrical engineer, I care about billionths of seconds and even shorter increments, but is there a finite measure of time?
Gregg Rco
May 4, 2023 at 2:00 pm
THANK YOU !!! GREAT !
Luiz Henrique
May 4, 2023 at 2:09 pm
on level 2 he had already lost me 😅😅
Gregg Rco
May 4, 2023 at 2:25 pm
Youtube’s Science Asylum and his space time diagrams is the only reason I could remotely try to keep up with yintz ! Really enjoyed this conversation !! Very curious on details of what you two discovered ! Thank You !
pepe velez
May 4, 2023 at 2:27 pm
its interesting to see the beginning of the chat is about mathematics and as it progresses in a subtle way turns into a philosophical conversation.
Richard Boland
May 4, 2023 at 3:25 pm
Gotta lol at the grad student conversation basically covering Back to the Future
Mike Hoang
May 4, 2023 at 5:42 pm
Host: So what did you learn today?
Me: That I’m dumb 😀👍🏽
R Ronay
May 4, 2023 at 6:03 pm
I loved this I rewind it to absorb the information
KeisonMibute
May 4, 2023 at 7:49 pm
Dang. I was almost fine until college. GPS blew me up.
Askan Helström
May 4, 2023 at 8:03 pm
travel to the past, and the existence would stop, with a high pitched “plop”
chase scanlon
May 4, 2023 at 11:16 pm
Brian greene can put anything into words for the average person. Wonderful video
Russ Wayne
May 4, 2023 at 11:23 pm
It’s too bad that Rabbi Aryeh Kaplan is no longer with us, because I’d love to hear Mr. Greene have a talk with him.
JorgeZermeno11
May 5, 2023 at 12:19 am
I’ve always hoped for a gazillion dollars in the bank
MT H
May 5, 2023 at 1:43 am
Brian Green talking to a 9 year old. “No! You’d still be alive, and everybody else would be dead!” Haha. No filter for science.
John Lee
May 5, 2023 at 2:15 am
Did anyone lose track of time watching this? 😂
Guide504
May 5, 2023 at 2:32 am
The chicken and the egg are simultaneous in evolution.
Adam Alexander
May 5, 2023 at 2:53 am
Omg that little girl is adorable lol
Adam Alexander
May 5, 2023 at 3:07 am
Imagine if only a fraction of mainstream media news time was spent talking about this kind of stuff instead of the latest Trump drama, how much smarter we would be as a civilization?
FortNite Temple
May 5, 2023 at 3:45 am
This is incredible. Brian Greene has always been beyond excellent
mickshaw555
May 5, 2023 at 4:21 am
16:15, think out of the Eintetinian non-sense box. GPS clock is slower because of lower gravity. There’s no connection between time and speed, strong gravity slows down time.
ExtravagantPanda
May 5, 2023 at 9:21 am
First of all, gravitational time dilation _is_ part of the “Eintetinian non-sense box”, as you put it. And second, that’s exactly what they are talking about in the video.
Boris S.
May 5, 2023 at 6:11 am
Where does the perceived concept of Time come:-
Summers were longer when you were young? At 2 years a year is half your life when you’re 50 it’s a 50th of your life a year seems to go quicker.
When you exercise really hard the last few seconds of an exercise can last ages, and a given time of relaxation seems to fly by.
When taking your thought processes to the limit time passes quickly, which is why racing drivers at the highest level are young. Even musicians the more you are in tune with what is going on the more time you have between individual moments.
Shumonster
May 5, 2023 at 9:19 am
Oooooooo. More like there, please!!!!
Raantas
May 5, 2023 at 9:33 am
He explained the definition to child with more difficulty than I’m being taught at high school
Dan Olson
May 5, 2023 at 3:16 pm
Brian Greene can explain the most sophisticated and complicated theories into the most basic simple terms, and that makes him the greatest gift to all fans of physics.
Michał
May 5, 2023 at 3:17 pm
Am I understanding the last convesation correctly, that we basically live in a “block universe”?
aareth1
May 5, 2023 at 3:19 pm
Grad student looks like Ron Jeremy in his 20s…
zen lotus
May 5, 2023 at 3:49 pm
Thats the thing once you are past our time and space there is no concept of past. Past and future are 1. Past and future only exists in 3 D. Not beyond that.
zen lotus
May 5, 2023 at 3:52 pm
Time is not real. Something which does not have beginning does not have ending. Time would have been real if there was a beginning. And please dont say big bang was beginning. Because even for big bang it is necessary for something to exist before that.
Andy Dufresne
May 5, 2023 at 3:54 pm
We should all understand that we will never be able to understand the creator’s mind. We just cannot comprehend and and we all are bound by the laws of our universe.
It is better to let it all sink in and enjoy while yall are still here.
David Katuin
May 5, 2023 at 6:19 pm
Love to have a conversation with Brian Greene.
Mészáros Krisztián
May 5, 2023 at 6:49 pm
It lecture was amazing!!!!
Please do the same with STRING THEORY. 😊
John Buchan
May 5, 2023 at 8:56 pm
I think physics is cool, like how the kids are the same size as Brian Greene
David Renwick
May 5, 2023 at 9:42 pm
I’m with Kayla (only just.)
2011littleguy
May 5, 2023 at 10:35 pm
No one but Brian could get me to accept that – just like all of space is out there, so all of time(past, present and future) is out there right now.
(See his special on time).
For Shiggles
May 5, 2023 at 11:45 pm
That was fascinating. The math was way beyond me but I like the idea that having existed I will always exist in some capacity.
Nautilus1972
May 6, 2023 at 1:51 am
Now that string theory is a joke, Brian needs a new gig.
TheBlueDevil ___
May 6, 2023 at 1:57 am
Solace… 🤯🙏😌
Venky Babu
May 6, 2023 at 2:29 am
Time is a gradient of matter and energy and space. Distribution. If you add up all three you get zero.
science birds
May 6, 2023 at 8:10 am
as a theoretical physicist myself, I really enjoyed the last conversation – but can we please talk about the socks (and especially where to get them)?
Pablo A
May 6, 2023 at 9:39 am
Boltzmann……
ioc.daoland by Rene Goris
May 6, 2023 at 10:14 am
My question is if gravitational lensing could bend light in such a way that it becomes like a mirror? If so, should gravitational lensing cause boundaries to our vision on the universe, and at the same time make the universe look bigger than it is?
Hala Gula
May 6, 2023 at 10:22 am
Time-
Time was invented in earth by humans to organize their daily lives or routines and we made a tool called CLOCK
It’s just measurement of earth’s rotation movement around sun
Sun rise day sun set dawn and then complete night
depends on season/geography in different parts of the world clock shows time differently
Can you travel in past – No
Why ? Grandpa paradox
Can you travel in future – we don’t know but my gut is telling me may be not
Scenarios and outstanding question-
If there’s a spacecraft traveling at speed of light, leaves earth today and come back after 2000 earth years,
What will be age of travelers in that spacecrafts compare to earth years ?
All living beings born, decay and die on earth. Cells of their body will eventually decay and organs in their body will eventually get tired and stop working resulting death. It’s Mother Nature’s law of earth
Is that law going to apply on travelers in that space craft too because they are also living beings. If they are traveling at speed of light will it apply slowly?
But again spacecraft travelers are not coming to future of earth. They are coming after 2000 earth years which will be present state of earth. New humans, animals, insects, plants, trees, or who knows humans mess around with nuclear bombs and destroyed all living beings
For travelers it may look future for them because they were at speed of light but speed of light is their current state
Skaarj
May 6, 2023 at 10:26 am
What a nice gentleman, Dr.Greene. Thank you very much for this video.
LaymanScribe
May 6, 2023 at 11:50 am
Now add the sixth element and talk about time with a 100 year old physicist. That would be wild.
KJ
May 6, 2023 at 1:39 pm
Would I be wrong in saying that we could define time as the progression of a reaction, whether that be the chemical reactions, physical interactions between celetial bodies, etc. If you think about something like aging, we associate that with the passage of time, but really all it is is a progression of chemical reactions within the body… Let me know what you think 🙂
Ladakhi Nerd
May 6, 2023 at 1:58 pm
If you’re talking about time, Einstein gotta be there.
Robert Jahn
May 6, 2023 at 2:09 pm
I dont get what this light tic toc slowing down has to do with time. Its just a physical proces changing because of some manipulation. I can do that: grab the pendulum of a clock and make it stop. Presto time has stopped!
Derek Leung
May 6, 2023 at 2:41 pm
“Can you stay still and not travel to the next second in time?”
Yes. *ZA WORLDO!*
Taha Hassan
May 6, 2023 at 3:57 pm
Really good, differentiating between different ages. Unfortunately, I made it to the second one and need to relearn my maths.
Guide504
May 6, 2023 at 6:48 pm
If the universe was not expanding we would not have time.
MNS
May 6, 2023 at 9:23 pm
Not impressed. Wheres my pizza delivery ?
Peter McGill
May 6, 2023 at 9:47 pm
My favourite is; time is what stops everything happening at once.
Pursuit of Truth
May 6, 2023 at 10:32 pm
*God doesn’t make mistakes. None of you (or me) will EVER understand time completely. We may come close to the edge of the fish bowl but we will only end up turning back on ourselves. This physical life has limits for a reason – like the Matrix movies depict. We are here for a reason, in a perfectly constructed environment for the ultimate test.*
Paul
May 6, 2023 at 10:34 pm
I,m mechanical engineer not theoretical physicist but time explanation is made so mysterious. Time is matter process indicator . If we take distance , space they are immaterial emptyness infinity continuum where our universe exists. So if we throw ball it travels distance in certain speed. Then we describe time by physics definition t= s/v where s distance v is speed that describes ball travel. Both distance and speed are immaterial that gives time for physics as well immaterial. So time is matter process interval. Time have only one way ticket and past see astronomers . If we take special relativity there are no way to bend two immaterials such time and distance. Good luck guys.
Hannah the Hun
May 6, 2023 at 11:07 pm
I followed my GPS in eastern Kentucky one day, and it led me down a dead end road (it was supposed to go through) to a tin roof shack with a cow tied up to a pillar on the porch. Gee thanks, time.
Glaucus
May 7, 2023 at 2:01 am
He lost me at the teenager part lol,my math days are long behind me
Dany Monroe
May 7, 2023 at 2:17 am
Wow this video was one of the greatest videos that I’ve seen👌🤍
SAK
May 7, 2023 at 2:44 am
The one for the nine year old is my speed.
daling dingaling
May 7, 2023 at 3:32 am
16:30 I’m glad Borats cousin is studying in New York University. VERY NICE; GREAT SUCCESS!!!
Philosophy@
May 7, 2023 at 8:03 am
∆t is the delay in occuring of 2nd initial event the event that provoke 2nd final event,as ∆t = 2nd initial event -1st initial event=future ∆t = 2nd final event -1st final event
Ho Lee Sheet
May 7, 2023 at 8:18 am
I love this longer and more elaborate explanation of things……. Keep doing it….
F Ray
May 7, 2023 at 9:43 am
He is such a good teacher!
Melinda M
May 7, 2023 at 5:24 pm
I value any and all conversations on how understandable and non esoteric they are at conclusion. I have to say that initially I got lost a few times but when it came down to the final conversation I had more comprehension. THANK YOU. This was very illuminating and also comforting to me. I was very very ill in the hospital a couple of years ago and came to terms with one of the concepts you discussed of being amazed that I existed in this time and space and given the life I had been given, upon being told when I went into surgery that I may not come out of it alive , I felt at peace and just fine with it in my own right, although not so for any stress and sadness my family would feel. Ultimately, I experienced a speed up and slow down of time in that very moment. I had only moments before I would be taken into emergency surgery and infinitum to value all I had had, been and connected to. I guess that sounds very hocus pocus and unscientific at best, but listening to this discussion made me realize it probably had more to do with science than I realized.
Mike Mcdonnell
May 7, 2023 at 8:11 pm
A person goes into a coma Wakes up 20 yrs later Sees his baby brother now 20 yrs older Did he travel thru time in effect?
Allen Huang
May 7, 2023 at 10:08 pm
8:25 Brian Greene low key gives the most complex explanation to the high schooler 😂
Madam Curie
May 7, 2023 at 10:39 pm
My brain age is 9.
Shawn Lajambe
May 7, 2023 at 10:50 pm
Well done!
David de Hilster
May 8, 2023 at 12:13 am
This is why mainstream science is stuck. There is no critical thinking going on anymore. Just arrogance and ego. Time is a made concept to measure movement. Nothing more.
Tim Kasey
May 8, 2023 at 12:44 am
If what this guy is saying is true, relative to his comments to the young girl. UFOs & ET are being viewed because they are passing through time, yet stopping to interact with our time before they continue on further into the future.
Wolf Taco
May 8, 2023 at 5:17 am
Is it embarrassing that I got lost at teenage level 🤣
Dushyant Chaudhry
May 8, 2023 at 6:20 am
8:09 Prof green could have just used Pythagoras’s theorem for (1-v^2/c^2)^1/2
Roedy Green
May 8, 2023 at 6:51 am
If you head out on a rocket ship and back, you age slower than those who stay on earth. But motion is relative. How does the universe decide if the rocket or the earth moved?
Great McLuhan's Ghost
May 8, 2023 at 7:14 am
If time and space is a continuum, then gravity is too— and consciousness must make it all possible.
GORDON SMITH
May 8, 2023 at 8:53 am
I have found out how to travel in time! I just have to sit and wait.
raphaelgoncalves
May 8, 2023 at 10:56 am
But if the “light clock” is moving, and its time measurement is longer than the stationary clock, does it really mean the time is going slower while in movement, or simply the clock’s capacity to measure time is affected by the movement while the time is going at the same pace?
DJ Nejo
May 8, 2023 at 3:15 pm
lost at minute 8 but still interesting to listen.
NSJay
May 8, 2023 at 4:35 pm
Now I’m just the average joe here but I love contemplating the hypothetical of if you can travel to the future does that make or mean that future is fixed? This is based on the fact if we find a way to travel to the future without the speed of light where in a way I like to explain it as we’re taken out of space while everyone lives in the space slowly. Thought of this my first physics class in highschool where they explained to use we see in the past.
Andrew Elias
May 8, 2023 at 5:03 pm
This was the biggest jump between grade school and high school yet.
Level 1: It takes a year to go around the Sun.
Level 2: COSINE THETA, BITCHES!
Lui Z
May 8, 2023 at 5:08 pm
Ok, now ask that college student what a woman is
Ice Troll
May 8, 2023 at 6:54 pm
The big bang?? Still??
J Cole
May 8, 2023 at 8:08 pm
I like that they chosen above average intelligent representatives for each of the 5 groups. Each was able to keep up a little bit with Greene at their level. Made the video better.
arkouda
May 8, 2023 at 9:19 pm
I see why they didn’t put the college student in the intro 😂
Miguel López Sáez de Ibarra
May 9, 2023 at 4:04 am
To write way down on the blackboard denotes depression or sadnes?
Michael G
May 9, 2023 at 5:16 am
Time is the measure of motion or of change.
Find an absolute existence which is not subject to motion or change or becoming and time no longer has meaning.
God is outside of time for there is no motion or change which affects His being or nature.
Ever ancient yet ever new.
Miru Jowo
May 9, 2023 at 8:09 am
I try to watch with one thing in my brain, i won’t understand any of it. I actually suprised, i get some understanding..
Miru Jowo
May 9, 2023 at 8:39 am
My getting : compared to the universe, we live in really short time, like blinking eyes. So make it count at least to ourself
Vegeta
May 9, 2023 at 8:50 am
Im 24 9:01 and had match and science in high school…my brain here got a bit f*cked up
Vegeta
May 9, 2023 at 9:00 am
16:25 Well look like Elbert Einstein found he’s way back or should I rather say forward 🤫
FallaciesDetective
May 9, 2023 at 12:12 pm
The universe and its laws point to the triune God.
Suabhihba Suraj
May 9, 2023 at 3:13 pm
If you believe in the concept of time and attenuation of signal … the chances of us communicating with alien race is low actually TENDING TO 0 … reason is simple we are always in continuous motion be it with reference to sun or centre of galaxy or any galaxy far far away … the signal burst sent out at the snapshot of time out of earth with a particular reference to constellation will either dissolve as the frame of reference itself isn’t constant or attenuate to nothing within a light year
jitinder
May 9, 2023 at 4:32 pm
The Italian guy looks at Greene like “Are you gonna let me talk or what? I’ve got a haircut and a suit! And socks!”
Cube Wizard
May 9, 2023 at 10:31 pm
The light clock is brilliant
신중용
May 9, 2023 at 11:47 pm
I got lost at the teen level.
c123jdflkj39
May 10, 2023 at 4:06 pm
Lol yep
jaydotdiver
May 10, 2023 at 12:13 am
My sense became ordered but my certainty felt like went into entropy. Be like water.
Vijay R
May 10, 2023 at 12:56 am
Note:1. time =distance/speed.
Speed=speed of light=c
2.Ts=L/C
3.Tm=D/C
So therefore
Ts/Tm=L/D
How he can get D/L ,I can’t understand at @7:00
Tom Nolan
May 10, 2023 at 1:01 am
I too
Felis Super
May 11, 2023 at 10:51 am
You have it backwards. Remember that it is the observer who’s stationary that sees the light moving along the longer diagonal. So T_S = 2D/c (we multiply by 2 because the light beam hits the second mirror after travelling a distance D, and then it has to go back to the first mirror, so the total distance is 2D). T_S is the time taken relative to the observer who’s stationary, and it is he who sees that light travels a distance 2D. Likewise, T_M = 2L/c. Dividing these equations, you get the expression D/L.
Andrew L
May 10, 2023 at 3:26 am
This is 🔥.
Crab Lord
May 10, 2023 at 11:19 am
I hope this little talk inspired the kid to explore these topics more. These early exposures are so important
Max West
May 10, 2023 at 2:58 pm
Level 6 -Tom Baker explains time.
賴瑞斯
May 10, 2023 at 11:27 pm
If we look AI as a kind of black hole by analogy,then….
Edouard
May 10, 2023 at 11:36 pm
I’ve rarely seen such a great teacher. However I don’t understand why he doesn’t consider that there may be no philosophical issue going through a wormhole because things would be crushed and lose information coherence and would have no influence.
Soulartist13
May 11, 2023 at 12:24 am
Always make time for Dr. Greene
Angelo Siracusa
May 11, 2023 at 1:10 am
What if through black holes you go back in time, but of the same consequences as the present? Like if the game is constantly restarting it self washing out the future of the universe. This way we will always be going back to the same moments over and over for eternity.
Dope ReFLX
May 11, 2023 at 10:43 am
That 16 year old girl must be smarter than me because i got lost as soon as the chalkboard came out.
Nishchal B A
May 11, 2023 at 11:30 am
Ask Kang what’s time, he will explain more clearly than this guy…😅
Eric Texley
May 11, 2023 at 1:34 pm
WHy are these worth my bandwidth?
Sam Easter
May 11, 2023 at 1:58 pm
I started getting lost at the teenage level, I’m 50.
And dumb too apparently.
DoNotEnter
May 11, 2023 at 2:21 pm
Can we have a baby/toddler level please!?
I’m 45 yo and my brain stopped when he ask the 9 yo kid how many times earth revolved around the sun.
beautifulsmall
May 11, 2023 at 8:56 pm
is how much a multiplication
nuno sousa
May 11, 2023 at 10:53 pm
Maybe there’s an universe in which the video guests would appear in a reverse order, but still be presented as child, teen, college student, grad student and expert.
SuperCarrot3FullPower
May 11, 2023 at 11:47 pm
He is one of my favorite scientists
Gavin Fillop
May 12, 2023 at 12:21 am
🌎♻️☠️
J Z
May 12, 2023 at 11:30 am
22:26 Brian I think you meant to say “to you “ the moving persons time will slow down and they will hit at the same time
oraurus
May 12, 2023 at 1:31 pm
The only man known to history that was able to go to the future are Ashabul Kahfi (7 sleepers) and the prophet Muhammad SAW
Zee Deva
May 12, 2023 at 9:08 pm
It looks easy because the kid and the teen actually pay attention. Good luck doing that in a public school classroom.
Matary
May 12, 2023 at 10:28 pm
i always love when prof Brian explain something, he always try using the simplest way..
Rick B.
May 13, 2023 at 9:06 am
If a tennis ball gets pushed through a curved pipe, can it get pushed so fast that it’s particles collide with itself? … That is what I thought about watching this and talking time travel…
Tony Stark
May 13, 2023 at 12:28 pm
So basically Philosophy lays the foundation of science and then science gradually and eventually transforms into philosophy, so the conclusion is everything in this observable universe is just Maya( ILLUSION).
Molly Bolton
May 13, 2023 at 2:30 pm
Level 6–Brian Greene explains time to a Time Lord. Uh wait…
Parv Sharma
May 13, 2023 at 2:40 pm
Why is that unit time, in the mirror photon example
Safetyman99
May 13, 2023 at 6:39 pm
Is it just me, or did the grad student look like a young Einstein?
Brian Greene’s lectures are mind blowing… love that guy.
PipluPipluP
May 14, 2023 at 3:40 am
The same question came to my mind also! 😯😲
The fourth person looked very similar to Einstein! 👨🏻🔬🥸
Zhenya Landyak
May 13, 2023 at 6:53 pm
There are enough physicists who doubt that the speed of light is a constant
Zhenya Landyak
May 13, 2023 at 6:55 pm
I really wonder how bloody complicated level 3 is gonna get xD
JP A. Ariguin
May 14, 2023 at 4:05 am
Wait a minute..
What’s with the suit and their socks?
Fortnite Master
May 14, 2023 at 6:27 am
still didn’t understand why stationary clock had longer distance and moving clock had shorter distance
Joch
May 14, 2023 at 9:11 am
I think that Time is a derivative of space.
alex ledezma
May 14, 2023 at 10:27 am
What bunch of bull….!! All of this are just theory … Theory funded on the big bang theory… In other words… Theory funded on a theory… An erroneous foundation will generate erroneous theory..
Thomas Paine
May 14, 2023 at 12:20 pm
You have no idea what a scientific theory is, hate to see your school grades
Gabe Dutton
May 14, 2023 at 11:14 am
The best and higher production videos wired releases end up doing worse than the dumb celebrity videos they do smdh
Tom Almow
May 14, 2023 at 12:53 pm
Time in terms of habits/skills of maths leave humanity to wonder on.
Andy Gilleand
May 14, 2023 at 2:40 pm
I have no idea why some people feel the need to use greek letters in their math. Using the same letter with a subscript is also annoying to me. Just use a unique letter for every variable. Things like that just make it look more complicated than it actually is, for no good reason.
Andy Gilleand
May 14, 2023 at 3:01 pm
The most interesting question I’ve always had that I’ve really been unable to answer about time is this: Explain time without using terms that require the existence of time to make sense. For example, if you use the word “change”, a change inherently requires the passage of time. It is incredibly difficult to try to explain what time is without using terms like this.
Barra Hart
May 14, 2023 at 5:18 pm
Me just here understanding and appreciating every level of difficulty. And how about the phases of life so adorably represented here? The second the teenager started talking, I was like… Yep.
P Mc
May 14, 2023 at 8:31 pm
Good job not tipping off the adult that you are a wizard Kayla!
P Mc
May 14, 2023 at 8:35 pm
They teach physics to freshmen!?!
Pieter Van den Abeele
May 14, 2023 at 9:34 pm
So I am at the level of a child
SuperGGLOL
May 16, 2023 at 1:21 am
So what? I am not even a child. I don’t even exist. Because I don’t care.
Michael Wacey
May 15, 2023 at 12:04 am
I think time is just a way to account for motion.
superiorEGG
May 15, 2023 at 1:01 pm
This is golden content
Thay Riverx
May 15, 2023 at 2:28 pm
I think the moving clock thought experiment is iffy. Like we’re charging a path traveled by the light that isn’t the actual path it would travel
Thay Riverx
May 15, 2023 at 2:36 pm
It then there’s also time as a resource. Like free time. Which then brings into play the qualities of the content within the record. Like does my picture of the present moment contain me doing labor or does it contain me doing leisure.
Christopher Cooper
May 15, 2023 at 8:42 pm
I understood the first level…
Churn Blanston
May 15, 2023 at 10:35 pm
Holy crap! I was lost at teen, and I think I have a better grasp on this topic than most. I’m still a relative moron, apparently!
games
May 15, 2023 at 11:53 pm
time is of the essence
Ozéas Carvalho
May 16, 2023 at 12:28 am
Fascinating! What the heck is a mile, though?
doubts
May 16, 2023 at 12:48 am
I like listening to a guy called Peter Russell. He explores the philosophy, the mathematics and dare i say it, ideas of consciousness.
Travis Thornhill
May 16, 2023 at 12:52 am
I doubt this guy understands any of this stuff beyond the elementary understanding he conveys. I’d love to see him hit the board and do the math, but I don’t think we’ll ever see him do that.
SuperGGLOL
May 16, 2023 at 1:21 am
Bro the first 10 seconds with the 9 year old kid was hella confusing for the kid. ‘Passage of time?’ Bruh she’s 9
EarlGrey
May 16, 2023 at 3:04 am
Omg.. i’m an adult with two bachelor degrees and my brain already checked out on teen level 😂
Bogdan Sur
May 16, 2023 at 4:16 am
Is time discrete?
Chiara Neko
May 16, 2023 at 12:05 pm
9:28 what happens if I change L? How is it defined?
Bros 4 Ever
May 16, 2023 at 1:36 pm
Great video thanks! I wish I could remember where I was when Napoleon entered Moscow….
james holmes
May 16, 2023 at 1:42 pm
Yeah. The teen. She understood that.
Roro2.00
May 16, 2023 at 6:14 pm
The teenager was hilarious. “Time is a social construct” followed up by “when are we ever gonna use this crap” hahahaha
Charles O'Connor
May 16, 2023 at 6:57 pm
It’s incredible time changes with gravity and speed and can be clearly measured it’s a fact. I just wander if the biological clock would be affected in the same way as a clock.
Abhishek Pratap Singh
May 19, 2023 at 4:38 pm
-0:space
Maitrey: space-time
+0:time
Reptilians are here
May 19, 2023 at 6:03 pm
The grad student took an edible
Matt Duquenoy
May 19, 2023 at 8:24 pm
Who else was completely lost with the College student and him talking about trigonometry!? I was thinking, there’s no way I’m going to follow the rest of this!
Paul Morley
May 19, 2023 at 8:51 pm
Kaku does it, Greene does it, and it gets under my skin for some reason. I don’t like when these guys go for the Einstein-hairdo. When the O.G. did it himself, he did it because he was too busy honing in on Relativity and all that, it makes me think these guys are faking it in a way.
Mariana Antillano
May 19, 2023 at 9:49 pm
“Because it might be a brief flicker, on a single moat of dust, like, floating in a cosmic eternity, but, it’s *everything*. There’s nothing else that I’ll ever experience, and so, in a way, there’s nothing else to me.”
Fuah… hermoso.
ibnumachmud
May 19, 2023 at 11:49 pm
My professor told that those who have higher proficiency and comprehension in one thing, will likely simplify the explanation more easily. That’s why I love this content. I can even understand physics even if I am a linguist.
Dipsunder
May 19, 2023 at 11:50 pm
“There is a preferred frame of reference in this universe ” – 🤯 22:17
ACS CP
May 20, 2023 at 12:19 am
First sentence my SR professor told the class:”we are not a philosophy course” lol
Uberpomar Sith
May 20, 2023 at 2:34 am
Obviously the expert has an accent, obviously.
Takeshi Kimura
May 20, 2023 at 6:27 am
I’m baked asf and I wouldn’t be able to carry on a conversation with this guy better than the 9 year old 💀
Frank DiMeglio
May 20, 2023 at 9:40 am
Consider WHAT IS THE EYE ON BALANCE. (Notice the associated black “space” of WHAT IS THE EYE ON BALANCE, AS BALANCE AND completeness go hand in hand.) WHAT IS E=MC2 is gravity. Consider TIME AND time dilation ON BALANCE !! TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE, AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE). Accordingly, ON BALANCE, the rotation of WHAT IS THE MOON matches the revolution. INDEED, consider what is the fully illuminated AND setting/WHITE MOON ON BALANCE; AS it IS the SAME SIZE as what is THE EYE. It ALL CLEARLY makes perfect sense ON BALANCE. INDEED, consider, ON BALANCE, why and how it is that there is something instead of nothing. Great. LOOK at what is the TRANSLUCENT AND BLUE sky ON BALANCE !!(THE EARTH is ALSO BLUE.) Consider what is the ORANGE AND setting Sun. Magnificent. Notice that, ON BALANCE, the curvature or shape of WHAT IS THE MOON matches that of WHAT IS THE EARTH/GROUND. TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE, AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE). Consider TIME AND time dilation ON BALANCE. INDEED, consider WHAT IS THE EYE ON BALANCE. NOW, consider what is THE SUN along WITH the fact that the stars AND PLANETS are POINTS in the night sky. A given PLANET (including WHAT IS THE EARTH) sweeps out equal area in equal TIME. Great. WHAT IS E=MC2 IS WHAT IS GRAVITY (ON/IN BALANCE). Consider TIME AND time dilation ON BALANCE !! INDEED, consider, ON BALANCE, why and how it is that there is something instead of nothing. Great. Consider WHAT IS THE EYE ON BALANCE. c squared CLEARLY represents a dimension of SPACE (ON BALANCE). Magnificent. I have CLEARLY proven and explained what is the fourth dimension. WHAT IS GRAVITY is, ON BALANCE, an INTERACTION that cannot be shielded or blocked. Great.
By Frank Martin DiMeglio
Thabiso Mokokwane
May 20, 2023 at 12:50 pm
Look, if all atoms somehow rearranged into the same exact position they were in 3 days ago, would that be time travel?… or would it be a change in space? As I see it, this is only time travel if you insist on being an external observer to these changes, if not then theres is no time travel, no time, just changes in space.
Christopher Hovord
May 20, 2023 at 1:38 pm
Love this episode 😊 I could have listened to Massimo Porrati and Brian Greene talk all day about physics 😅
Mr.Wiiick
May 20, 2023 at 2:25 pm
Black board: “I’m about to end yalls careers”
Dominick DeGennaro
May 20, 2023 at 3:17 pm
I can’t believe I have gone this long knowing about time dilation without actually doing the simple trig that shows it. 🤯
QN
May 20, 2023 at 4:21 pm
I like Brian, but a bit of advice for anyone explaining this to a teenager in 5 minutes: The long mathematical proof he went on was needlessly complex, and could have been much simpler. It started out well, but by the end he used a more complex equation than needed. A simple example, he didn’t have to sine and cosign. It’s layer of abstraction that’s fine later, but he introduced way too much, too quickly for that teenager, and they were clearly just watching him scribble chalk on a board by the end. And I bet he would agree if you asked him. Too much, too quickly. It’s almost like for every age he wants to ensure they are impressed and confused.
Logan Willhite
May 20, 2023 at 8:30 pm
Concerning the billiard ball example, or really any physics-breaking scenario – why would disruption an action like that matter? You’d be altering an object’s trajectory in time (light path or whatever it’s called) but why does that matter? Why is changing an outcome like that important at all – even if spacetime was broken to make it happen?
Qbits Day
May 21, 2023 at 12:17 am
Maria Guseva is on the DOT about time “Man Made Idea”
Doji Chawan
May 21, 2023 at 1:24 am
Since all particles are part of space time…after death we continue to be present as basic elements that are part of this paradigm!
susanht67
May 21, 2023 at 2:54 am
He lost me at tic tock
Stanislas De Nijs
May 21, 2023 at 5:35 am
Lost time and reality watching this vid
Vodou Lou
May 21, 2023 at 8:21 am
Man I love Brian Greene. 😊
Cameron Bowes
May 21, 2023 at 9:18 am
So if you want to move fast you’ll have to find a way to move space through space or relative to other space, but not objects speeds or times relative to eachother, because the energy required to move space is actually just technically difficult, but resourcefully easy. Hence time travel being a little more complicated than space travel. Not that engines don’t exist that would be able to do both, but the likelihood is that without extremely precise mathematics of higher dimensions, that as a person moves through spaces and times they’ll enter different possibility/probability vortices and end up somewhere uninhabited by their fellow sentients.
wimker
May 21, 2023 at 12:13 pm
The Grad student discussion finally addressed something that’s been bothering me for a very long time. Whenever we say someone approaches the speed of light, we say they would age slower relative to someone who was not traveling. But if everything is relative, wouldn’t the person NOT traveling be actually traveling near the speed of light relative to the person traveling? One of them ages faster than the other. So indeed their MUST be a preferred frame of reference in this universe. I kept wondering why no one talks about that, and something must be wrong with my thinking. But finally I hear someone address it with the laser/doughnut discussion here. Interesting.
1 1
May 21, 2023 at 6:20 pm
time is an illusion, the experience is relative change
Itabarkita
May 21, 2023 at 9:51 pm
Lost it at approximately 08:00 😰
Ricicici 33
May 22, 2023 at 12:29 am
Lost all respect for this guy when he said the speed of light in miles per hour🤮🤮🤮
Prem Punjabi
May 22, 2023 at 2:10 am
24:01 you are seeing Leonard & Sheldon talking.
rhysmuir
May 22, 2023 at 3:57 am
With space and time being connected, I think the “arrow” of time is connected to the expansion of the universe – time flows forwards as the universe expands, and for time to flow backwards, the universe would need to shrink back to the big bang
Scarolinaviper Blue
May 22, 2023 at 11:39 am
4:13 thats it!
smartbart80
May 22, 2023 at 1:37 pm
I swear I could hear Sheldon chuckling somewhere in the back 🙂
Charles De La Mare
May 22, 2023 at 2:29 pm
I got lost half way through ‘teen’ level.
…I’m 30.
Janno Meeuwessen
May 22, 2023 at 5:40 pm
His Level Teen was equal to the other peoples Level College Student
Sujit Kumar
May 22, 2023 at 7:44 pm
I am absolutely fine with the formula for time dilation. I am just not convinced it will really slow the biological clock for a fast moving organism.
Jian Li
May 24, 2023 at 10:13 pm
Why Ts/Tm =D/L?why not L/D?
Richard Long
May 25, 2023 at 12:10 am
The real testament to relativity is just how quickly this half hour elapsed
Alex Sampson
May 25, 2023 at 12:32 am
I think these videos would be even more interesting if as the levels of difficulty increased, the speakers would stop speaking to the audience. I want to see exactly how experts in their field talk about this subject. Not how they would talk on a panel at some science communication event. I want to be blown away by feeling like I dont have any idea of what they are talking about, be given a taste of how tough this stuff really is. I am a PhD student studying applied math, and the most complicated terms they used were, topology, compactification, and Hausdorff. I should be starting to lose touch with the topic around the graduate level, and be totally lost at the expert level. Dont hold back!
Rhizophagous Ramblings with R.P. Humunculi
May 25, 2023 at 2:35 am
Awesome concept! Thanks much!
Kevin M.
May 25, 2023 at 3:22 am
Introducing trigonometry to a teenager???!!! That’s a suicide mission…
matiako
May 25, 2023 at 8:06 am
Wondering if Mathematic at the Big Bang and the Big collapse changes.
Lana Plants Love
May 25, 2023 at 11:09 am
Ugh, I can’t tell you how much I’m in love with this man. <3
Eric Dejonge
May 25, 2023 at 6:24 pm
He’s like if Bill Maher was nice
eLLe Booggie
May 25, 2023 at 9:50 pm
I did my best understanding when he taught the 9 year old. 🙂
Sukrit Chandra
May 26, 2023 at 3:26 am
It’ll always be there? 30:53
What is ‘always’ !!!!?? I need to know
Nano Teilchen
May 26, 2023 at 12:29 pm
Does anybody know the title or doi of the paper they were talking about at the end?
Slindile Ngcobo
May 26, 2023 at 1:57 pm
Well there you have it. My level of understanding of time and mathematics ends at the 9 year old’s 🤷🏾♀️
TheBnzr
May 26, 2023 at 4:40 pm
Dr Greene is a great example of a scientist who also knows and understands how people learn science
ShaPowLow
May 26, 2023 at 6:12 pm
this video pushed me to the valley of despair after 6:00. taught me the difference between an interested layman, a real hobbyist, a serious student of the subject and a real expert.
phthisis
May 26, 2023 at 8:27 pm
It’s too bad they didn’t get into the perception of time based on the speed of the heart and other factors. Creatures with fast heart beats will regard their environments moving at slower speeds than those creatures with slower heartbeats (hummingbirds can’t watch cartoons, etc.), larger creatures will typically move and react at slower periods of time than smaller creatures (human vs mosquito), and plants are so slow-moving that they’re essentially exhaling during the day and inhaling at night (which brings new meaning to the Ents’ argument in “The Lord of the Rings”). The addition of drugs like adrenaline can help speed the beats of the heart, allowing for heightened reflexes and the perception of a “slow-motion” effect. Video games and films, which emulate real life, have instituted “bullet time” since the late 90’s (“The Matrix”, “Max Payne”, “Hitman”, etc.) in which audience members/players will experience a time-slowing effect that gets triggered for heightened effects, and sometimes, a jarring change of pace. I would have liked the 6th Level of Difficulty: Dr. Brian Greene explaining time to a hummingbird.
g t
May 26, 2023 at 9:46 pm
“You would measure time the immeasurable and the measureless ” Kahil Gibran.
Gustav Sand
May 27, 2023 at 1:04 am
I learned a lot but the most interesting phenomenon was how people who learn about time and relativity slowly turn to a single look. This makes me believe that the person who understands time and relativity better than Einstein will eventually look more like Einstein than Albert Einstein himself!
Madhurendra Mishra
May 27, 2023 at 3:34 am
😀Do read my blog
The Douglas W. Lipp Channel
May 27, 2023 at 7:30 am
I’ll watch this later.
Thomas Kim
May 27, 2023 at 8:44 am
Bro that teen lvl discussion… what the
springvale light
May 27, 2023 at 10:35 am
I believe that is why 18 is a year in “time” , in 5 different numbers in time we have decided what is called an ADULT! It is true and real and paradoxical to think that is why someone is called a minor. Even more difficult is that these things are not really difficult to understand so as we do basic things like ex. problem solve, we should resolve our issues as close to the truth as we can. And the TRUTH –what does that have to do with measurements, time, motion, movent, even math? I believe it has more to do with quality of life and world wars that we really can live a better life but only through problem resolution and now what psychological cycle offers us the best statistical possibility of that? Monarchy ? communism? dictatorship? democracy? because inside of the laws of physics is the ability to make these laws real, to use these =s to move in time to a better understanding and quality of life…..what if we lived in LIES – and these =s for gravity were wrong and the speed of light was wrong or the law of motion was a wrong theorem ????????? it = the IQ of the masses..scary
bmayaa
May 27, 2023 at 10:55 am
I think people, mountains, planets, galaxies, it’s a minor organization of small particles – and at the particle level time doesn’t exist. So it doesn’t matter if the earth goes around the sun. They’re just atoms and molecules moving around. Time is important to people. Elementary particles don’t care about “time”.
Lots of Stuff
May 27, 2023 at 12:46 pm
Time is the measurement of the frequency of change
Jean Baptiste Simurabiye
May 27, 2023 at 12:52 pm
Realized a kid had to stand and move and the teenager needed a board a chalk.
Adam21
May 27, 2023 at 4:22 pm
what a truly beautiful discussion.
Sadan Mallhi
May 27, 2023 at 11:09 pm
This video was great, I learned a lot however I’m struggling to understand the step explained at the 6:50 time stamp;
“More time on the stationary because it’s longer distance on the moving clock”
If we are trying to get the ratio of Stationary time over Moving Time, why then did we use the distance D over distance L? Shouldn’t we be using the distance L over D?
Can anyone please help clarify this to me?
DuckOnABike
May 27, 2023 at 11:39 pm
In order to go back in time you would have to essentially reverse the big bang. Planets are moving through space in a linear fashion. So you can leave a planet and return and it has continued it’s linear path. In order to go back in time you would have to reverse the linear path.
DuckOnABike
May 27, 2023 at 11:41 pm
This makes me think that once the universe expands too far like an elastic band it goes back through time to a singular point and the big bang repeats.. what if time moved back and forth repeatedly.
DuckOnABike
May 27, 2023 at 11:44 pm
I don’t think a machine or concept could be built to reverse all galaxies that is the point of reversing the big bang.. you need to reverse everything. Not just earth.
DuckOnABike
May 27, 2023 at 11:47 pm
Forward time travel is easy because we are meeting earth in space at a later date.. that involves moving ourselves which we can control. You need to reverse planets relative to us..
Analuz Frejoles
May 28, 2023 at 12:44 am
I’m a physics graduate. And the way we derive those formula that lead to the E=mc^2 took us a a whole 50 leaves ordinary notebook to completely finish it, well including the graphs and the like. It’s just amazing that he simply illustrate it in a way that even ordinary viewers.can understand.
Shifu Mohideen
May 28, 2023 at 2:29 am
ohh ive waited for this for long time <3 adore Brian Greene
Kuremurin
May 28, 2023 at 8:54 am
Explain Trigo to a High Schooler.
Meh
larung batojutsu
May 28, 2023 at 1:25 pm
I kinda dumb so could u explain to me, why the Tstasioner/Tmoving equals to D/L. If velocity is distance/time, so time is equal to distance/velocity.
So if Ts = 2L/C
And Tm = 2D/C
Then shouldn’t be the ratio of Ts/Tm = L/D ???
Please be kind and enlighten me, i am kinda lost in there
distanova
May 28, 2023 at 4:49 pm
I finally understand time thanks to the 9 yo girl
Milligram
May 28, 2023 at 8:03 pm
You should have a format with an expert explaining a concept to experts of different fields.
James Paslawski
May 28, 2023 at 11:36 pm
I’m 44 years old and I thought I was reasonably informed on time… he lost me at teen!😢
Camilo Ramirez
May 29, 2023 at 7:43 pm
the easiest way to explain the back and forth in time ambiguity is to show a person a sunrise and a sunset without telling them what it is – you can play the video backwards or forwards but still you won’t be able to say what it is.
Zack Miller
May 30, 2023 at 2:17 am
Based off of the high schoolers question, she did not give a single care in the world about that equation😂, “will we actually use this in our daily lives”
Musical_Lolu
May 30, 2023 at 3:26 am
Next level: Discussion with Dr Strange.
Biswarup Ray
May 30, 2023 at 4:45 am
Sometimes I feel Brian Greene was Einstein in his earlier life!
Daniel Kofi Mensah
May 30, 2023 at 6:13 am
I only understand this at level 1 😅😢. I need to learn some physics.
Hugo
May 30, 2023 at 1:33 pm
ChatGPT can also do this
Mike Bermea
May 30, 2023 at 11:09 pm
The Time Force Hypothesis is an interesting and novel hypothesis of time.
Carlos Valadez
May 31, 2023 at 2:46 am
Brian is the man
B N
June 1, 2023 at 1:20 am
So that’s how the equation came to be 😂
migi_hidari
June 1, 2023 at 2:11 am
Uh… Am I dumb? I barely Understood the first level.
Jesper Aung
June 1, 2023 at 6:33 am
This dude is the teacher we all wish we had at each level.
Josh I
June 1, 2023 at 11:00 am
And that my friends is how you discuss a topic in which you really don’t know and you have no clue what it really is.
danielove69
June 1, 2023 at 11:17 pm
It’s time some Greene missiles
sweetsweetmeat
June 2, 2023 at 12:30 am
Grad student looking like a young Ron Jeremy.
R B
June 2, 2023 at 8:12 am
doesn’t make sense, we are missing something
joe ward
June 2, 2023 at 11:22 am
What if I happen to have a special little capability. By which I can travel at 29billion ×faster than light?
Talha Saavedra
June 3, 2023 at 5:49 pm
What do you mean by that?
jphani shankar
June 2, 2023 at 2:28 pm
Key to understanding time is to know there is no such thing its an illusion
Darth Fluffy512
June 2, 2023 at 2:40 pm
My question is, because the big bang was proven somewhat false, what was supreme order now?
stewart stancil
June 3, 2023 at 12:04 am
That’s exactly why the space telescopes keep confusing the astronomers and they cannot figure out why the universe has galaxies that are too complex for where they should be in time. They think they are looking back in time, but they are doing nothing but seeing a galaxy in real time. Time only moves in one direction.
Christopher Evan Sanders
June 3, 2023 at 3:21 am
T.i.m.e. = tomorrow. Infinity. Make-believe. Eternity.(buzzers sound) What are four concepts that don’t exist in reality except for in the minds of charlatans and theoretical scientists.
Cyberghost
June 3, 2023 at 3:58 am
I think making the concept more complicated just ruins the description.
yung redi
June 3, 2023 at 8:49 pm
i love that the teenager immediately comes in with “time is just a man made concept”. such a teenager opinion to hold
Alan Kramer
June 3, 2023 at 9:52 pm
31:26 “very nice” – Borat
Joseph
June 4, 2023 at 12:02 am
I’m 40 and I stopped watching after he explained it to the kid. It was ‘time’ for me to go
ElectricDreamer
June 4, 2023 at 12:12 am
16:35 that guy looks like Einstein.🤣
Stu Pidassol
June 4, 2023 at 9:58 am
My brain turned to dust at teen level.
acid crayon
June 5, 2023 at 11:44 am
Don’t hug me I’m scared still gave the best explanation of time.
Prof Prostate
June 5, 2023 at 1:18 pm
Time was made up by clock companies to sell more clocks
ahtan2000
June 5, 2023 at 10:37 pm
Why is he using level 5 on the 16 year old? 😂
ahtan2000
June 5, 2023 at 10:46 pm
The level 3 guy unfortunately fell into the mode of “i need to show you i know stuff” than “learning mode”
Mike Macpherson
June 6, 2023 at 2:09 am
You need to add in another level. The complete jackass. Someone who just yells, “yeah right buddy!” And, “whatever, pal!” And then you just argue with him. Or just give me the math that can send me to the reality where this is already happening.
Ismael Corpsegrinder Montemayor
June 6, 2023 at 5:12 pm
They HAD to include a member of the alphabet mafia, they just had to 🙄
Paul Russell
June 6, 2023 at 8:13 pm
As soon as he took to the chalkboard, I felt sorry for the Teenager because he completely lost her and the majority of the audience very quickly and made no effort to find them again. If anything, he launched into even greater complexity.
Neby Moges
June 6, 2023 at 11:05 pm
it’s 2023 and Wired doesn’t have time stamps on a 30 min video.
talk about getting with the times.
Ran P
June 6, 2023 at 11:26 pm
0:31 does he have simpler explanation?
Sorot P
June 7, 2023 at 1:35 am
I need a Level 0 : Cat.
John hendrickson
June 7, 2023 at 6:02 am
He lost me with the high schooler 😅
Constantina Mylona
June 7, 2023 at 8:04 am
This is science communication at its best!
Ted Krasicki
June 7, 2023 at 9:08 am
Not having negative time going backwards in time) must be the same as we can not have negative heat below absolute zero.
alondra garcía
June 7, 2023 at 12:10 pm
Thank you very much for your book: ” The Hidden Reality”
Pappa Pappi
June 7, 2023 at 1:32 pm
Strange coincidence 😉!!? Why are all candidates here of Latino ancestry.. or Italian !?!!!
But Greene is not…
I mean, not that I didn’t enjoy the conversations.. it goes some time a bit too deep for my formation.
But is there any rational reason for that choice.. 🤔😶
Petter Carlsson
June 7, 2023 at 5:24 pm
The mathematics we have today is not capable of describing “everything”, I think there has to be some sort of evolutionary step being taken in order to actually understand what’s going on in the universe and then, only then, maybe describe it mathematically.
Jake ZX
June 9, 2023 at 3:53 am
Nope.
chagkruz art
June 8, 2023 at 3:01 am
9:26 this is not enstein’s formula, this is Lorentz–FitzGerald contraction formula. Do not mislead the young
Asher Wade
June 8, 2023 at 4:49 am
Want to travel to the ραst-?, …check with Kurt Gödel; he figured it out on pg.555 of Vol.2 “Albert Einstein: Philosopher-Scientist”; 😉,
…see ya` later “🙋♂️🚀💫✨
Michael N
June 8, 2023 at 10:14 am
I think you guys can just do three levels! Child, adult, expert
Illusion
June 8, 2023 at 5:26 pm
We call it the infinity paradox!! It’s easy, while you’re talking here in the video you are at the same time the mountain I see in my eyes!! Or another example: while I’m writing this TEXT, I’m actually the TREE and the bird at the same time !! This is because frequencies in nothingness and LIGHT PARTICLES in nano particle form in infinitely many directions cross simultaneously !! we don’t sweep the frequencies !! only the light illusion😊😊😊😊😊😊😊😊
Illusion
June 8, 2023 at 5:33 pm
But all what we mean that is , IS NOT HERE !! it overlaps, so to speak, in an infinite number of directions at the same time
Danforth Pape
June 8, 2023 at 8:08 pm
I’m only 9 min in and I’m already laughing out loud!! This is hysterical!!
Jack Monarch
June 8, 2023 at 8:12 pm
You lost me at teen bro
Mauricio Franco
June 8, 2023 at 10:54 pm
These physicists sure have a great sense of style
downvotes own posts
June 8, 2023 at 11:43 pm
It’s great that kids are being taught this stuff in a clearly understandable manner. I didn’t learn the actual math until college and it took me some time to really grasp it. Of course, I could just be a slow thinker.
Jake ZX
June 9, 2023 at 3:52 am
Theoretical Dumbass
wangdydu
June 9, 2023 at 9:33 am
feel like i learned something, but actually not a bit
Akaliptos
June 10, 2023 at 7:27 am
Hmmm i feel kinda stupid …i was good until the maths on “teen” part.. you start losing me there … And then in the part with the young Pablo Escobar around 16:23 all i was hearing was “fgrwsedghrehsdfgfdwsghwrhwe” just noise…
Patrick Emmett
June 10, 2023 at 12:15 pm
i was pretty confused with everything after he started doing the math on the board.
Rod Raymond Albarico
June 10, 2023 at 2:49 pm
Time is running either you move or you sit still. Space is always there whether you move here or there.
jahba
June 11, 2023 at 11:23 am
well that escalated quickly
mujarin
June 11, 2023 at 11:58 am
i think the expert put it very well in saying that its “childrens stories”
MoonTrees
June 11, 2023 at 6:45 pm
Such a good series. I love seeing how they talk to kids, treating them with respect ❤
DeeaM33
June 12, 2023 at 2:38 am
So basically what chat GPT does now
1995 akcoop
June 12, 2023 at 9:49 am
Was I the only one who got lost at level 2…. im 46 😔
Nellosphere
June 12, 2023 at 10:14 am
The mirrors are ALWAYS MOVING!!
Nellosphere
June 12, 2023 at 10:17 am
Rotation and Orbit are continually effecting our observations.
Nellosphere
June 12, 2023 at 10:36 am
You cannot reverse causality.
ladiesman2048
June 12, 2023 at 3:24 pm
poor teen
Keith Radebe
June 12, 2023 at 5:16 pm
Short summary: we don’t know what time is.
ChaossX
June 12, 2023 at 11:54 pm
What a treasure he is.
Noah R
June 13, 2023 at 12:58 am
Don’t they use time dilation in GPS satellites ?
Health and Happiness
June 13, 2023 at 8:54 am
Here is an unique phenomenon. Since in theory, time is eternal and space expand into infinity, I am in middle.
Takara FX
June 13, 2023 at 11:42 am
This is like hearing a cult teaching 😅
Clockwise
June 13, 2023 at 12:46 pm
“He has crazy hair” 😂😂 she’s adorable lol
Harishkumar Dosala
June 13, 2023 at 2:02 pm
I think Einstein just born to confuse people with mathematical talent… Just works on paper don’t workout… Regarding the age slows at faster speed… He no nothing about biology and cell cycle…
mick mccrory
June 13, 2023 at 4:50 pm
Explaining physics to the public is as useful as trying to teach calculus to a dog.
alfie
June 13, 2023 at 5:27 pm
Walter White in a parallel universe energy
Or better yet Heisenberg
Emma Loves To Learn
June 13, 2023 at 6:04 pm
This makes me so excited! I’m a Sophomore in college just beginning my journey in science. I’ve chosen to do a major in physics and a minor in chemistry. The topic of time is so fascinating. I cannot wait until my job is to study all these fantastically interesting topics and questions. This guy is a legend and an inspiration!
Cactusblah
June 13, 2023 at 7:58 pm
Theoretical physicists are purposely misleading people. Time itself is constant. Things can’t move forward or backward through time. They’re just moving slower or faster.
Vorador Hylden
June 13, 2023 at 8:12 pm
Ha. “Has anyone ever tried to go back?”…..
“No!”
Well how do you know its not possible if noone ever tried? Ahahahaha
Hans Krill
June 14, 2023 at 7:39 am
Right, so here’s a thought that I, as a complete layman, have entertained for some time now and is somewhat similar to the thought experiment he suggests, where time is circular and you send a laser out to your left and right and then slightly move to the left.
If we replace the laser with ‘the image of yourself’, which is possible because space is circular, remember, so it should be possible to actually see ourselves if we look into space, hypothetically.
Now, if everything happens instantaneously, it’s like looking in a mirror, but what if in that very instant I moved to the left of my original position and that light that suddenly had to traverse a smaller amount of space, would reach me sooner due to my change in position, would that mean that I was practically looking into my past?
Consecutively, assuming that it would indeed mean such a thing, can we assume that “I” my “self” has already left that moment I would be looking back at, and would have travelled with me to that new position?
I ‘feel’ that it would. At that moment it would be like I was looking at a picture of myself. It would be me, but it would no longer contain my ‘self’.
What does that say about the ‘speed’ of our consciousness, our self, our soul (forgive the unscientific terminology ;)?
Could it be that it is faster even than the speed of light?
Or could it be that maybe our consciousness is inherently timeless?
Sorry to ramble. I’m by no means scientifically trained or schooled, but this is a question that has been bugging me for years and this video prompted me to revisit it.
createone100
June 14, 2023 at 11:50 am
He lost me during the trigonometry in the second explanation.
Eshtomcaroala
June 14, 2023 at 1:08 pm
9:35 we already do in a scale that is unimaginably large.
GPS devices are simply very precise clocks that needs to compensate for time dilation to properly triangulate with satellites.
Tony
June 15, 2023 at 3:40 pm
There is no such thing as time-dilation concerning GPS clocks. Mechanical clocks measure motion through space. Ground based and satellite based clocks are simply measuring two different rates of motion.
Tj LoVerde
June 14, 2023 at 8:05 pm
I can’t even understand level 2😂
Omar E
June 14, 2023 at 10:13 pm
He lost me at the teen level
sas garbage
June 15, 2023 at 1:30 am
It’s difficult to talk about change without time because that’s how we talked about it
S R
June 15, 2023 at 2:11 am
I lost at 4:05. I know im stupid.
Steven Coutinho
June 15, 2023 at 12:25 pm
There is a problem with Brian’s geometric explanation: it doesn’t take into account the time it takes for that same “diagonal” light between mirrors to hit our eyes to actually observe it going diagonally (and thus observe one clock going faster than the other). For some odd reason physicists omit this in deriving the Lorentz equation.
Another issue which goes all the way back to Einstein’s paper: he assumes that there is a clock which measures “t” and something called distance “X”. But the existence of both are disputable (just use Ayahuasca!) and it leads to a circular argument: we assume smth (x) and (t) and then come up with a formula that states that they are “one” thing called spacetime (x,t).
I asked my old professor at Uni (I am a physicist btw) who didn’t have an answer and pointed me to philosopher Henri Bergson who seemed to argue same. So let’s just be careful in believing we are closer to truth… in the end we’re all just trying to make sense of our own senses.
steven Manson
June 15, 2023 at 5:05 pm
The dead part got a little dark but this guy us awesome
Alvatros L
June 15, 2023 at 6:27 pm
It it’s possible that the clock Lost it’s accuracy but the time remains the same. I’m mean the device is NOT the time.
Neighbor Guy
June 16, 2023 at 11:00 am
I don’t think we’ll ever figure out how to go back in time because….
If we could in the future, we’d be able to now.
The first Airbender
June 16, 2023 at 2:16 pm
based on this..im a 31 yr old child 😂
equaldigits
June 16, 2023 at 7:39 pm
The last part of the video was slightly interesting but still doesn’t make any sense. Seems like two drunk guys trying to understand a closed door.
Alberto de Almar
June 17, 2023 at 10:38 am
Wake up, eat 7 grams of majic mush , there is only 1 thing , I call it , all that is , which all always was , is an will be, but actually it is was and will be only if you divide your infinite self into a spectrum of time rather than just knowing all is , period, you bore me with your limited stupidity
Rizu Kankon Das
June 17, 2023 at 12:49 pm
Teen right away showing teenager characteristics. Pretend to know every secret of the universe 😒 and all the controversial theory of this ain’t real that ain’t real of the social media
B G
June 17, 2023 at 2:53 pm
Someone has actually traveled forward. There has been measurable time dilation on the ISS.
Custódio Armindo Gungulo
June 17, 2023 at 3:21 pm
I even took the screen shot of the child equation. Great Brian!
Jay
June 17, 2023 at 4:21 pm
After watching this video, I regret not taking physics because of the fear of it simply being hard. But when he started explaining time in terms of trigonometry, I found myself saying “OHHHHHHHHH!” Like I actually relearned something and sparked interest in learning more about the concept of “time.”
Brosobloo
June 18, 2023 at 3:06 am
Now that reddit is dead, can we rename the next season to Explain like im 5 😂
Loidz PC
June 18, 2023 at 4:20 am
Can you feature Neil Degrasse Tyson also?
Anthony Cho
June 19, 2023 at 3:42 am
Isn’t Time (stationary) / Time (Moving) = L / D?? Not D / L?
Zoltan Vers
June 19, 2023 at 5:44 am
😅 how much b******* and fairy tales the earth is flat
Correntkat Correntinfo
June 19, 2023 at 6:07 am
Wow
Don Moskowitz
June 19, 2023 at 8:01 am
In the discussion at the graduate student level, there is mention of the idea that taking acceleration into account is how the Twins Paradox is correctly resolved. Not so.
bionicgeff
June 19, 2023 at 8:12 am
Bro if someone asked me how many times the earth went around the sun in my lifetime im gonna give them the blankest stare lol
Luk Natu
June 19, 2023 at 10:50 am
Ok. I got lost in a teen level…🙂
Arsenic
June 19, 2023 at 4:51 pm
Brian Greene is not a theoretical physicist, he’s a real physicist!
H Chris Sparks
June 19, 2023 at 4:58 pm
Wait, time on the stationary clock over time on the moving should be small number over larger number; but then you say it equals D/L which is big number over smaller number??? So, isn’t that backwards? I think Einstein is really saying they are equal, due to time dilation and length contraction isn’t he?
Babatunde Kalejaiye
June 19, 2023 at 9:32 pm
The most confused individuals are the best teachers.
1504MBR 1504MBR
June 20, 2023 at 2:01 am
You had to end up with a they, them, didnt you.. Im sure “they” went to berkley
victor utomo
June 20, 2023 at 5:55 am
I’m not familiar with the concept of entropy. The explanation about egg smashed/unsmashed is brilliant.
Human Augmented
June 20, 2023 at 12:10 pm
You’d look good with a stein
Foxspo1
June 20, 2023 at 8:03 pm
I still don’t understand his explanation on the board for the TEEN explanation. Why does the moving clock have six lines and why does it make that diagonal line?
ELZ
June 21, 2023 at 11:36 am
He had to be trolling that 16 year old
Kevin Walden
June 21, 2023 at 4:05 pm
Okay, I think I’m getting it. *head in hands*
Now explain it to me like I’m five
Internet-Gangsta
June 21, 2023 at 4:37 pm
my brain struggles to understand much of the concepts discussed here,My brain was made to eat, survive and reproduce.somehow I have this curiosity in me to seek knowledge on how this universe works…. despite my shortcomings I know my creator,the true God which is nature,energy,Universe, conciousness gives me life daily whether I understand time , mathematics or all this technical stuff,oh how I wish I understood the majority of concepts in mathematics.Despite all that,me and the best scientists we have are going to the dirt regardless of the differences in our intelligence,oh boy plz someone tell the creator how I wish mathematics was easy to understand, it’s obviously the language of this universe but my silly goose self seems to not know much about it…but I know God,not a religious God,but the true creator,I experience it( him/her…the principle of gender) everyday.happy existence everybody, don’t go out of existence before your TIMe😂😅❤
Cole Lacey
June 21, 2023 at 5:34 pm
The teen is just a Parrot. Heard somewhere that time is man made but can’t explain why, just like flat earth people. She was trying to be smart and ended looking lost with out a clue.
Marked Men Films
June 21, 2023 at 7:37 pm
This man is so much smarter than me it’s making me laugh.
Bob C
June 21, 2023 at 9:35 pm
Level 1000: time is more like a big ball of wibbly wobbly, timey wimey … stuff.
Rod Dominguez
June 22, 2023 at 1:43 am
It’s all a decoy. Once they (govs) come clean about Antarctica and the “UFO”, reported by pilots and others, that defy everything we know, then we can talk.
Siddharth Pant
June 22, 2023 at 4:55 am
shouldnt the ratio be l/d not d/l? 6:50
Jason Turner
June 22, 2023 at 10:29 am
Yes time is relative. I aged ten years watching this.
Kyle Russo
June 22, 2023 at 3:46 pm
I guess Im a 9 year old in understanding time
Gerardo Domínguez Castro
June 22, 2023 at 4:49 pm
3:00 you know this is an american girl bc he uses freedom units instead of IS.
JingoLoBa57
June 23, 2023 at 8:28 am
Wonder what he thinks and says about the recent JW Telescope shot releases.
F I
June 23, 2023 at 1:55 pm
30:09 ❤
30:54 ❤❤❤
DL3SE
June 24, 2023 at 2:05 am
What if we use digital clock instead for time differences will still appear?
V Menon
June 24, 2023 at 4:47 am
Nobody knows, even if you stop the time along with the space, how our biological clocks behave. We could only quantify the biological ageing process with Space -time scale. If space time stop, then also our biological clock never stops, ageing continues.
Glenn Floyd
June 24, 2023 at 7:50 am
Green cannot help himself no Academic Public Purse Parasites can.
EPISTEMOLOGY: the theory of knowledge, especially with regard to its methods, validity, and scope, and the distinction between justified belief and opinion.
• A Liar: Someone who knows their statement is unsubstantiated – false.
• An Idiot: Someone who cannot grasp fundamental reality.
• A Charlatan: Someone who opens his mouth, pushes out phrases; and says absolutely nothing.
Green is a Liar and a Charlatan!!
When your calculations cannot proceed when pushing theory with no experimental hypothesis testing apparatus, all you need to do is CONCOCT a non-reality such as SpaceTime, which CANNOT be either ‘fundamentally defined’ or shown to be true, because time itself does not exist, travel, elapse or move, contrary to Green’s lies.
And to push your permanently-tenured-retirement APPP career further, all you have to do is invent another concocted inexplicable concept to explain SpaceTime; which also CANNOT be either ‘fundamentally defined’ or shown to be true, these charlatans and liars call it the 4th Dimension!! It’s a Good Little Earner!
The Catholics did it in 325AD at the First Council of Nicea when the alleged god theory failed, so they concocted The ‘BlessedTrinity’, & why the Life of Brian was a mass hit!
Inexplicable SpaceTime = Inexplicable god and Inexplicable BlessedTrinity = Inexplicable 4th Dimension, cool numerology, note the reliance on numbers 4th and trinity to confound those too stupid to question charlatan numerology the belief in an occult, divine or mystical relationship between a number and one or more coinciding events.
All is known 21C Philosophiae Naturalis Principia Physica
Lola Westham
June 24, 2023 at 8:03 am
Can you please also add an explanation to a regular adult who doesn’t remember math
BlaqueMoon
June 24, 2023 at 10:19 am
why was this so fun to watch lol, I felt like a kid
Atticus Savage
June 24, 2023 at 11:29 am
I love Brian greene
Amanullah Shaikh
June 24, 2023 at 12:04 pm
No paradox exist ,😅
Ninja Nerd Student #69
June 24, 2023 at 12:55 pm
This guy was on Big Bang Theory. Sheldon was making fun of him.
Aazaad
June 24, 2023 at 7:39 pm
I wish I could one day be friends with Alexander Novara.
Liked this dude
James Barrow
June 25, 2023 at 12:13 am
Well…that certianly answers the riddle of how “can you ever imagine a time when YOU did not exist?” I always come back with the asnwer “NO” =)
Jason Huntley
June 25, 2023 at 8:13 am
“The ultimate source of order is the Big Bang itself”. Atheists do everything they can to ignore the fact there must be a God.
Alex Tuduran
June 25, 2023 at 1:18 pm
Einstein showing up as a grad student.
Hatt Mancock
June 25, 2023 at 6:19 pm
“If you think you understand time, you don’t understand time.”
– me.
Andrew Curtis
June 25, 2023 at 7:56 pm
This man can explain 5 levels of time but can’t understand one level of sentience. A smart fool indeed.
Cyber Monkey
June 26, 2023 at 4:31 am
This is a fascinating episode. Thanks…but the thing that really makes me laugh, is the way Brian is talking about ‘time’ and then suddenly this 9 year girl , changes into a 16 year teen, right in front of Brian’s eyes, and he looks exactly the same! 😮 I guess that’s what you call a paradox. 😂
Gm mobassir
June 26, 2023 at 5:37 am
Mesmerizing
Connie Abrams
June 26, 2023 at 4:09 pm
I’m not mathematically inclined; can you give an explanation to non-mathematically teen
chipblood
June 26, 2023 at 11:39 pm
I loved every moment of this video. Thank you!
S P
June 27, 2023 at 2:29 am
Does anyone know the music to this. It was so calming
manjeet
June 27, 2023 at 5:03 am
18:28
And this one gives me chill everytime –> multiverse
Recently i came to know that old indian texts also has a similar mention of it .
Franklin Creative
June 27, 2023 at 9:18 am
Clearly a brilliant man, but he didn’t explain time even once. Time was not described nor defined either. Several aspects of time were discussed, which is valuable – but the title is misleading.
Skrifefeil
June 27, 2023 at 4:44 pm
He lost me at the teen explanation 😂
kha
June 27, 2023 at 5:09 pm
What preschool did the the second girl go to? Harvard? Dear Lord
Google User
June 28, 2023 at 1:22 am
I’ve watched Brian for years. His lectures are wonderful. He has a great way of explaining things.
Hmarieb30
June 28, 2023 at 4:26 pm
I always get excited about the grad student level, cause I imagine them being excited to talk to an expert about what they’re studying, and then just “fan-girling” on the inside
Thor Bartzi
June 29, 2023 at 5:22 pm
That poor teen. He lost her the moment he hit the chalkboard.
Krittika Biswas
June 30, 2023 at 4:07 am
I find the college student to be relying heavily on memorization and less on intuition.
Krittika Biswas
June 30, 2023 at 4:11 am
21:32 Isn’t there already angular acceleration then ?
Gary Cooke
July 2, 2023 at 5:49 pm
Not if space is curved:
Kasturi Swami
June 30, 2023 at 12:51 pm
I enjoyed the talk with the level four guy. My feelings exactly. We only know our reality and nothing more.
Kasturi Swami
June 30, 2023 at 12:52 pm
Very interesting even for a lay person like me!
BLANGO-SAN
June 30, 2023 at 3:31 pm
I love how they cannot even formulate the questions about time without using the notion of time
Chris Coombes
June 30, 2023 at 4:18 pm
I would like to see him with Karl Pilkington – I think Karl is my equivalent.
Nate Robinson
June 30, 2023 at 6:51 pm
I knew i was in trouble when i got lost when he was talking to the teen
Magaeatsboogers
June 30, 2023 at 8:16 pm
A clock isnt time. Time is an absolute it never changes or can be changed. When you hear anyone speak on time it always ends with an observation of time or the speed of a ticking clock, but actual time hasnt changed. when he speaks of the light bouncing off of a surface and bouncing back but then speeding it up and making the light longer. light has nothing to do with time. you can lengthen a lights time by speed of a surface, if you speed the surface up to faster then light then the light will bend backwards but it doesnt mean time will reverse, if it did then the experiments would reverse into itself.
x_hybrid
July 1, 2023 at 12:30 pm
Jesus is our saviour ✝
Mr_Happy GoLucky
July 2, 2023 at 12:09 am
Does the space between all atoms such as the ones in your body in the space between electrons and protons in General Grow greater as the expansion of the universe continues
Mythman3 Mythman3
July 2, 2023 at 1:23 pm
Don’t listen to moronic string theory pushers like this. Fact is time is just another word for change, and nothing more. It’s an abstract of the mind a non tangable thing and nothing more.
DoctorC
July 2, 2023 at 2:39 pm
I don’t know anything about interstellar but say a person was to spend 10 years on that planet or wherever they were I wonder how ahead civilization would be when we return to earth
Noryb
July 3, 2023 at 12:31 am
Is it just me or is it so crazy that I am learning identity not knowing why it is so important. I feel like teachers should show this more so that more students would be more interested.
Kushal Jain
July 3, 2023 at 5:14 am
Book recommendation: a brief history of time
lee dufour
July 3, 2023 at 9:59 am
Thanks!
greg gallego
July 3, 2023 at 12:03 pm
So being a pilot makes me younger?
Sebastian Emig
July 3, 2023 at 3:30 pm
I lost it already on the chalkboard 🤣
Ludicrous
July 3, 2023 at 4:11 pm
Feel so bad for that 16 year old getting thrown all that maths at her in a short time like that xD
Eel Noops
July 3, 2023 at 9:22 pm
I was lost at the child’s explanation. I’m almost 46.
synjin kai
July 4, 2023 at 2:49 am
Grad student = ron jeremy in a different life
Quantum Sirk
July 4, 2023 at 6:16 am
I don’t think you can prevent free travel to the past. You may be able to view the past informationally. We may just find that even though we go to the past, the moment we change it too much, we simply cease to exist in that state and the particles bounce back to their original state. But you can probably view all past events due to a clever use of entanglement and special relativity and artificial intelligence.
Eurico Gonçalves
July 4, 2023 at 1:15 pm
Just the nature of the click says all
Loan Wolf
July 4, 2023 at 8:05 pm
if crazy hair guy was right you would be able to travel any where in time or space you would be ever where and no where all at the same time
Loan Wolf
July 4, 2023 at 8:14 pm
let me know some day i can explain it to you
Kashyap Pandya
July 4, 2023 at 9:57 pm
Reverence to Brian Greene’s qualities of knowledge and empathy 🙂 .
Jason Aten
July 4, 2023 at 11:57 pm
Pretty sad i only understand the child’s explanation at age 39. At least I understand life isn’t fair because this is pretty depressing
Philippe Coulon
July 5, 2023 at 12:21 am
What scientific breakthroughs or fundamental changes in our understanding of physics would be required to allow for the possibility of faster-than-light travel while avoiding paradoxes and maintaining consistency with known physical laws?
David Hernandez
July 5, 2023 at 1:44 am
Why does the grad looks like young Albert Einstein 😮
Carmen sm
July 5, 2023 at 10:53 am
i was like “okay this is easy” and then in the expert one i didn’t get a SINGLE thing. up until there i was fine but then 💀
Brian Mc
July 5, 2023 at 12:56 pm
I think Brian overestimates what highschoolers have learned.
Clever Ghost Chili
July 5, 2023 at 2:35 pm
How about “what is a woman” in 5 levels of difficulty?
NUKE
July 6, 2023 at 7:47 pm
😅😅😅🤣🤣😂😂
Ganesh Tailor
July 5, 2023 at 2:57 pm
At 6:50, Brian mistakenly wrote D/L. It’d be L/D. So, consider this whole equation reversed.
Jeroen De Cloe
July 6, 2023 at 5:05 pm
You can’t explain time because it’s not well understood. We don’t even know if it’s fundamental.
Zachary Stewart
July 7, 2023 at 8:20 am
Omg this teenager is so smart.
Zeno's Grasshopper
July 7, 2023 at 9:39 am
30:36 every moment of your life exists forever. Interesting to consider what you and I are creating—in eternal existence—with our thoughts and actions.
Long Bong Josh
July 7, 2023 at 3:23 pm
bring back chalk boards🙏🏾
drunken observations
July 7, 2023 at 7:09 pm
We all know that going around the earth clockwise brings you to the future, and counter clockwise brings you back in time.
shahin
July 8, 2023 at 12:18 am
Assalam ualaikum❤
Thetruepredictor
July 8, 2023 at 7:53 am
This guy gets paid to make up fairy tales.
sajeyks mwangi
July 10, 2023 at 5:04 am
That grad student’s resemblance to Einstein is uncanny
emily
July 10, 2023 at 5:33 am
hi
John-e5
July 10, 2023 at 11:17 am
Connection to entropy? Why not mentioned?
SanziL Madye
July 10, 2023 at 6:32 pm
How does it apply to any other clock ? What he explained with a time clock?
How will me moving slow down a regular clock?
Galaxis
July 11, 2023 at 12:24 am
I feel like I just watched a video that is pretty clear on why there is an arrow to time. It had to do with entropy and why that works the way it does. Something like, things that are more likely to be are more likely to be. And that’s why we see certain things happen and not others. That’s why an egg can fall onto the ground and smash, but you’ll never see a smashed egg just reform and fly up off the floor.
Link
July 11, 2023 at 1:33 am
Rapid music!
David Walker
July 12, 2023 at 2:54 pm
We humans are curious by nature and we have come a long way in explaining the natural world and the universe but what if some things are beyond our mental limits things that have no explanation things that can not be broken down into mathematical formulas. Time could be one such thing
Mr. Cutch
July 12, 2023 at 5:47 pm
I love this
A Wondering Philosopher
July 13, 2023 at 1:18 pm
Time is the effect of motion and not the cause of motion, slower motion allows for more “time”, this is reflected in a journey tacking longer at low speeds, it is the same for the versa. So then if that is the case, how can gravity be time moving us through curved space, when motion comes before time? There must be something else moving us through said space, allowing for the exsistence of “time” 🤔
Nilabh Dash
July 13, 2023 at 10:23 pm
Can you explain the universe to a religious person please?
Maximus Augustus
July 14, 2023 at 6:13 pm
The first college student seems to be more confused with himself than the physics.
Skeptikal 👽
July 15, 2023 at 1:00 am
Time is a measurement of distance. Just super far distances or super large objects in movement. He explained this with the 8yo.
Jim Steitz
July 15, 2023 at 3:02 am
A closed universe would have a preferred reference frame? Struggling to comprehend that. Of course we’re also told that there is a ‘rest frame’ with respect to the CMB in our universe, which is equally confusing to me. Sigh, maybe one day I’ll actually learn this stuff for real.
Daimari.
July 15, 2023 at 3:46 am
I lost at level 2.
Samuel Okeke
July 15, 2023 at 6:37 am
Is there any explanation for toddlers, maybe I would understand that
Pastifier
July 15, 2023 at 10:18 am
Shouldn’t it be T_m/T_s in the Teen level? Since 2L is the distance covered by the photon to measure a unit of time in the stationary clock, wouldn’t T_s = 2L/c? Similarly, T_m = 2D/c. I think this also makes more sense, since as time increases for the clock in motion, it’s perceived to be slower. More time = slower. I don’t know though, the idea is still more or less the same, just wanted to check
stu Art
July 15, 2023 at 2:58 pm
I can understand time way better than you. Its not difficult.
Kareem Tk
July 16, 2023 at 2:00 am
unfortunately, It seems surprising that the real problem of traveling back in time is not considered here
SRIDHARAN SRINIVASAN
July 16, 2023 at 3:29 am
He is nothing like sheldon
Ali Abbas
July 16, 2023 at 12:16 pm
nice
shrinivas apte
July 17, 2023 at 5:14 am
The RIDICULOUS IDEA/CONCEPT Of time dialation cannot be proved because you cannot travel at or near the speed of light.
zodiacfml
July 17, 2023 at 8:11 am
thanks but I’m not going past the kids level.😂😂😅😅
يومياتTiktokبيكاسو
July 17, 2023 at 7:48 pm
You guys should really host Ahmad Bazzi
Joe Nahhas
July 18, 2023 at 1:12 pm
You are an idiot.
1- Humans observations are along the line of sight observations
2- Earth’s axial rotation (wheel = 2 π) alters observations by the sum of (a wheel + a wave) = (2 π + 7.640395578).
Classical astronomers accounted for the (wheel = 2 π) and missed the (wave 7.640395578). The error (wave 7.640395578) / (wheel = 2 π). Classical astronomers Aphelion-Perihelion (1/2 cycle) method of measurements = [(wave 7.640395578) / (wheel = 2 π)]/2 = ½ the error that produced the theology called the enlightened solar system data. Modern astronomers found the other [(wave 7.640395578) /2 π]/2 = ½ error = Modern Nobel winners’ Relativistic 4D space-time astronomy.
Yannsteve0 Matex
July 18, 2023 at 5:11 pm
Something has been troubling me since I watched this video. What is a clock in physics because I guess it’s not the actual clock he means if not we would’ve been able to control time with them. So what is a clock in physics
John Damato
July 19, 2023 at 1:22 am
Yeah I don’t think he knows what they’re teaching most 16 year olds lmao
Rashmi Choudhary
July 19, 2023 at 7:10 am
First 2 minutes is what Interstellar is about😅
Radha Krishna
July 19, 2023 at 1:10 pm
In this vedio we had talked about entropy which is one of the most key thing in the disorder of space..and thus we observe changes in space(assuming a constant time traveling at speed of light)..but when travel sufficient distances in space we see that there is change in time(provided we travelled back to the same point in space)..my question is, is there anything of a property like entropy which also acts on time?