When the May 2003 collision didn't occur, doomsday was rescheduled for December 2012, conveniently concurrent with the end of one of many increments of time known as Baktuns on the Mayan calendar. These 394-year periods have come and gone many times since the Mayans made their calendar, much like the months and years on the Gregorian calendar. But even practicing Maya don't believe the world will end on Dec. 21, 2012, when the 13th Baktun rolls over. As Morrison notes in his paper, "my desk calendar ends much sooner, on December 31 2009, but I do not interpret this as a prediction of Armageddon." Of course, Morrison also points out, the most compelling reason to believe Nibiru won't wipe out the earth in 2012 is that the planet doesn't exist. But try telling that to the man in the tinfoil hat.