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The Experiment That Tried to Weigh the Human Soul

It’s a little complicated to weigh a dying person on a hospital bed, but that didn’t deter Duncan MacDougall. In the early 20th century, MacDougall’s unique bed-scale detected that 21 grams left the human body at the moment of death. He had finally discovered it: the weigh of the human soul … or so he…

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It’s a little complicated to weigh a dying person on a hospital bed, but that didn’t deter Duncan MacDougall. In the early 20th century, MacDougall’s unique bed-scale detected that 21 grams left the human body at the moment of death.

He had finally discovered it: the weigh of the human soul … or so he thought.

Read more about the cultural legacy of MacDougall’s flawed but influential experiment:

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22 Comments

22 Comments

  1. @benmcreynolds8581

    April 7, 2026 at 3:10 pm

    I learned about this from one of my all time favorite TV shows “Dark Matters: Twisted But True” ~I highly recommend checking this show out. I almost never see anybody talk about this show..

  2. @piconano

    April 7, 2026 at 3:14 pm

    God created this universe so that he could live in it as life, everywhere possible.
    There is no I. I am a part of God that will never die. Soul or not.

    • @littlefrank90

      April 7, 2026 at 5:12 pm

      good for you

    • @arcanics1971

      April 8, 2026 at 5:34 am

      Nah, it was the Cosmic Whelk who invented the universe. He did it one Tuesday evening after a particularly spicy vindaloo. May his Holy molluscular univalveness endure for eternity. Asnails.

    • @ross-carlson

      April 9, 2026 at 8:23 am

      Really, and which of the 2000+ “god(s)” are you talking about? Is it Hera? Thor? Yahwey? Vishnu? What part are you? How did you determine this? How did your “god” create the universe? What evidence do you have for ANY of this that I can test and verify for myself?

      See, we’re talking about science and reality here – if you wanna believe in your fairy tales great, go right ahead – but when you tell others the intelligent of us will want EVIDENCE – got any? No? None? Really, none? Oh, some bronze age book of fairy tales written by nomadic goat herders – really?

    • @ross-carlson

      April 9, 2026 at 8:23 am

      @arcanics1971 Really, but what about the great Spaghetti Monster? I heard he did it.

  3. @Absbor

    April 7, 2026 at 3:19 pm

    Meanwhile ebay: “you’re not allowed to sell something which doesn’t exist or parts of a human body.”

  4. @wizzelhoart

    April 7, 2026 at 3:27 pm

    was a great Movie. Del Toro was amazing

  5. @Richthofen80

    April 7, 2026 at 4:02 pm

    Haver-hill… someone not from massachusetts lol.

  6. @Jolfgard

    April 7, 2026 at 4:42 pm

    So 21 grams of what exactly? What is the carrier, or at least the physical correlate to a soul? And via which channel is it emitted from the body? I mean, if we can reliably replicate the phenomenon, the next step is trying to THOROUGHLY explain it.

    • @ross-carlson

      April 9, 2026 at 8:20 am

      Which of course you can’t do since the “soul” doesn’t exist other than a concept.

  7. @Baylow94

    April 7, 2026 at 5:10 pm

    6:19 One Piece Mentioned! Yo-Ho-Ho-HOOOOOOO
    The One Piec is REALLLLLLL

  8. @likealeica

    April 7, 2026 at 7:00 pm

    So Vsauce2 finally finished her transition, and she looks way better than I expected

  9. @msm1player

    April 7, 2026 at 10:58 pm

    21 grams would be about half the internet worth of data weight…. sounds right

  10. @Doppel_MM

    April 8, 2026 at 5:54 am

    2:43

    And that’s precisely the problem. Air HAS weight. If he didn’t measure any difference, then it’s due to his measuring method.
    A football without air weighs less than a football with air; it’s a matter of the accuracy of the instruments.

    So if he can’t even achieve that level of accuracy, how does he expect to weigh something like a soul?!?

    • @ross-carlson

      April 9, 2026 at 8:20 am

      Well given it doesn’t exist he’s not going to measure that anyway…

  11. @GamesFromSpace

    April 8, 2026 at 1:00 pm

    The generic keyboard beats don’t add anything to the video.

  12. @superdinoman

    April 8, 2026 at 4:02 pm

    If you double 21 you get 42, don’t panic

  13. @TomTwain

    April 8, 2026 at 6:15 pm

    Infuriating presentation… lost my concentration… really irritating BG music and ranty voice…👎

  14. @ernmalleyscrub

    April 9, 2026 at 7:24 am

    Ask stupid questions get stupid answers.
    Primitive ideas about how humans behave persist. Ghosts and spiritual rubbish fascinate immature minds.

    • @ross-carlson

      April 9, 2026 at 8:21 am

      Yes, yes they do – was happy to see another intelligent skeptic in the comments. Refreshing.

  15. @ross-carlson

    April 9, 2026 at 8:26 am

    @6:41 Yes, we continue to exist in the memories of those that loved us. Beyond that? No, we’re dead.

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