In this highly personal talk from TEDMED, magician and stuntman David Blaine describes what it took to hold his breath underwater for 17 minutes — a world record (only two minutes shorter than this entire talk!) — and what his often death-defying work means to him. Warning: do NOT try this at home.

When you look at sporting achievements over the last decades, it seems like humans have gotten faster, better and stronger in nearly every way. Yet as David Epstein points out in this delightfully counter-intuitive talk, we might want to lay off the self-congratulation. Many factors are at play in shattering athletic records, and the development of our natural talents is just one of them.

From the EG conference: Productivity guru Tim Ferriss’ fun, encouraging anecdotes show how one simple question — “What’s the worst that could happen?” — is all you need to learn to do anything.

Would you choose to build a house on top of an unfinished foundation? Of course not. Why, then, do we rush students through education when they haven’t always grasped the basics? Yes, it’s complicated, but educator Sal Khan shares his plan to turn struggling students into scholars by helping them master concepts at their own pace.