UnNews talk:Europe to play "The Final Countdown" indefinitely
December 21 — The Mesoamerican Long Count calendar, notably used by the Maya civilization among others of pre-Columbian Mesoamerica, completes its thirteenth b'ak'tun cycle since the calendar's mythical starting point (equivalent to 3114 BC August 11 in the proleptic Gregorian calendar, according to the "GMT-correlation" JDN= 584283).[7] The Long Count b'ak'tun date of this starting point (13.0.0.0.0) is repeated, for the first time in a span of approximately 5,125 solar years. The significance of this period-ending to the pre-Columbian Maya themselves is unclear, and there is an incomplete inscription (Tortuguero Stela 6) that records this date. It is also to be found carved on the walls of the Temple of Inscriptions in Palenque, where it functions as a base date from which other dates are computed.[8] However, it is conjectured that this may represent in the Maya belief system a transition from the current Creation world into the next. The December solstice for 2012 also occurs on this day.
Note that it's not the first day of 2012 like the article says. I know this isn't really a fact-based site, but it's at least a bit funnier if you have some fact.