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Ask A NASA Astrobiologist About Dec. 21 'Doomsday'

16:52
Some doomsayers predict that the world will end on Dec. 21, 2012, citing the end of the pre-Columbian Mayan calendar. (iStockphoto.com)
Some doomsayers predict that the world will end on Dec. 21, 2012, citing the end of the pre-Columbian Mayan calendar. (iStockphoto.com)

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