Phil Plait: How to Defend Earth From Asteroids
What's six miles wide and can end civilization in an instant? An asteroid - and there are lots of them out there. With humor and great visuals, Phil Plait enthralls the TEDxBoulder audience with all the ways asteroids can kill, and what we must do to avoid them.
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The Skin Gun
A simple idea backed by stem cell research allows victims of severe burns to heal in merely days.
Charlie Todd: The Shared Experience of Absurdity
Charlie Todd causes bizarre, hilarious, and unexpected public scenes: Seventy synchronized dancers in storefront windows, "ghostbusters" running through the New York Public Library, and the annual no-pants subway ride.
Stewart Brand: The dawn of de-extinction. Are you ready?
This video is Stewart Brand's Ted lecture on the scientific challenges and moral issues surrounding the resurrection of extinct species.
How To Restore Your Faith In Humanity
Lost faith in humanity? These 10 moments may help you restore your faith in our species.
Hannah Brencher: Love Letters to Strangers
Hannah Brencher's mother always wrote her letters. So when she felt herself bottom into depression after college, she did what felt natural -- she wrote love letters and left them for strangers to find. The act has become a global initiative, The World Needs More Love Letters, which rushes handwritten letters to those in need of a boost.