Math @ TED

I'm a big fan of TED. They've published over 900 talks to date, not counting all the TEDx talks and I expect they'll hit 1000 just about in time for the new school year. (I wonder if we should do something about that?) Anyway, I've used many TED talks in my math classes in various ways and I thought it might be nice to have them all gathered together in one place. So, here they are, the 24 TED talks I think are most connected to math in some way. (Actually, I cheated, the last one is from TEDx Observer.) If you know of any I left out, or any TEDx talks that should be included leave a comment here and I'll add it in. Feel free to copy and repurpose this in any way you like.