Ask A NASA Astrobiologist About Dec. 21 'Doomsday'

NPR | Nov. 27, 2012 11:44 a.m.

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When people have questions about the end of the world — the predictions of the Mayan calendar or other apocalyptic events — they often turn to the Internet. NASA astrobiologist David Morrison has taken it upon himself to answer thousands of questions about the science of existential threats.