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PBS NOVA ScienceNOW S04E01, hosted by Neil DeGrasse Tyson.

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Uploaded on Jan 4, 2012

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Visit a laboratory where entrepreneurs are growing perfectly pure diamonds.

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The new science of microbial forensics reveals the source of the anthrax used in the deadly attacks of 2001.

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Profile: Luis von Ahn
A computer scientist finds novel ways to stop spammers and harness the brainpower of millions of people.

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