In this short talk, TED Fellow Sarah Parcak introduces the field of "space archaeology" -- using satellite images to search for clues to the lost sites of past civilizations.

The electric rise and fall of Nikola Tesla | Marco Tempest

What should future schools look like? How do brains learn? Some of the world's greatest educators, researchers, and community leaders share their stories and visions onstage at the TED conference, TEDx events and partner events around the world. You can also download these and many other videos free on TED.com, with an interactive English transcript and subtitles in up to 80 languages. TED is a nonprofit devoted to Ideas Worth Spreading.