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Astrophysicist Tyson On 'Pluto Files'

Feb 13, 2009 (Talk of the Nation)

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The director of the American Museum of Natural History's Hayden Planetarium and author of The Pluto Files, Neil deGrasse Tyson, talks about the future of NASA, Pluto's demotion to dwarf-planet status, and the difference between Darwin and Einstein.

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