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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Louie Schwartzberg: Nature. Beauty. Gratitude.
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Ai Weiwei: 'Life is never guaranteed to be safe'
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James Hansen: Why I Must Speak Out About Climate Change
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Roderick Romero - Treehouse Builder
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Cameron Russell: Looks Aren't Everything. Believe Me, I'm a Model.
In this fearless talk, Model Cameron Russell takes a wry look at the industry that had her looking highly seductive at barely 16-years-old.