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Phil Plait: How to defend Earth from asteroids

http://www.ted.com 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...

65,458 views

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  Joe Sabia: The technology of storytelling

  http://www.ted.com iPad storyteller Joe Sabia introduces us to Lothar Meggendorfer, who created a bold technology for storytelling: the pop-up book...

  42,456 views

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  Rebecca MacKinnon: Let's take back the Internet!

  http://www.ted.com In this powerful talk from TEDGlobal, Rebecca MacKinnon describes the expanding struggle for freedom and control in cyberspace, ...

  30,732 views

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