What do the story of Oedipus and your insurance premiums have in common? They are both driven by self-fulfilling prophecies. Philosopher and TED Fellow Carissa Véliz traces the hidden power of prediction, from Roman emperors who banned prophets to the AI algorithms quietly making decisions about your life right now. We tend to associate predictions with knowledge, she says, but they’re actually attempts to grab power. So the next time someone tells you a specific outcome is inevitable, remember: they aren’t describing the future — they’re selling it.

In 2009, marine biologist Sylvia Earle stood on the TED stage and made a wish: to build a global network of “Hope Spots” and protect the ocean before it’s too late. Seventeen years later, she’s back to report on what’s happened since — and the picture is both more urgent and more hopeful than you might expect. From 100,000 fur seals saved from near-extinction to coral reefs rebuilt clam by clam, Earle says we already know exactly what needs to be done; the only thing left is to find the will to do it. (Recorded at TED2026 on April 17, 2026)

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Octopus, squid and cuttlefish — collectively known as cephalopods — have strange, massive, distributed brains. What do they do with all that neural power? Dive into the ocean with marine biologist Roger Hanlon, who shares astonishing footage of the camouflaging abilities of cephalopods, which can change their skin color and texture in a flash. Learn how their smart skin, and their ability to deploy it in sophisticated ways, could be evidence of an alternative form of intelligence — and how it could lead to breakthroughs in AI, fabrics, cosmetics and beyond.