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Neil deGrasse Tyson is an astrophysicist, director of the Hayden Planetarium at the American Museum of Natural History, and host of "StarTalk Radio." His newest book, "Starry Messenger: Cosmic Perspectives on Civilization," is available now. www.haydenplanetarium.org/tyson/
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The most popular episodes from the JRE's origin (Dec 24, 2009) until the end of 2013 (Youtube views)