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December 21, 2012 - HISTORY
What Happened on December 21, 2012 - On This Day
Portal:Current events/2012 December 21 - Wikipedia
2012 phenomenon - Wikipedia
Historical Events in December 2012 - On This Day
How the World Could Actually End (and Almost Did)
2012 Apocalypse FAQ: Why the World Won't End | Space
2012 phenomenon - Wikiwand
End of World in 2012? Maya "Doomsday" Calendar Explained
21 December 2012 History Events - What Happened on December 21st 2012