Master of Disaster Roland Emmerich has another blockbuster on his hands with 2012, if weekend box office returns are any indication. The film's premise derives from a popular doomsday prediction centered on the Mayan calendar. It lasts 5126, at which point the calendar abruptly stops at December 21, 2012. For whatever reason, the Mayans didn't bother to count any further, leading some folks to conclude this denotes the End of the World As We Know. It makes for great entertainment, but what'sthe science behind all this?