A replica Mayan Calendar Round showing the date September 21, 2004, opening day for the Smithsonian's National Museum of the American Indian.
Molly Stephey/Smithsonian's National Museum of the American Indian
December 19, 2012 According to millions of people, the world will end this Friday. Commentator Marcelo Gleiser debunks the doomsday prophecy and reflects on why so many otherwise reasonable people fall prey to such ancient fears.
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