If you've got December 21, 2012, marked on your calendar as the day the world will end (or if you have a smart-phone app counting down the days until then), you might need to re-think things a bit. Well, more than a bit.
Scholars who work on such things as ancient calendars now realize that they may have miscalculated the true date of the end of the world on the Mayan calendar by anywhere from 50 to 100 years. Mayan Calendar
True believers will not be swayed, however. They never are. And those who waste time calculating such nonsense will still haggle over who has it right when none of them do. This is a cottage industry after after all, one in which the more often you get it wrong and the wilder the speculation you spin, the bigger the audience you will attract.
Too bad the ancient Dutch didn't leave behind some sort of mysterious calendar . . . Think of how much fun we could have had with that!