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Will future asteroids trigger massive extinctions—or be mined for precious minerals?
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For decades, the assassination of John F. Kennedy has fueled dark rumors of conspiracies...

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Host David Pogue examines groundbreaking research that aims to keep us out of harm’s way.
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NOVA  ·  Episode 4023

At the Edge of Space

11/20/2013

Can scientists unravel the mysterious phenomena that lurk between Earth and space?

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