Scientific Blogging considers whose prediction of the end of the world is more likely correct: that of the Mayans or of the Norsemen.
We know some people believe that the Mayans predicted the end of the world because one of their calendars, based on precession, ends on the Winter Solstice in 2012 – and we have to give them credit for being able to even calculate the Winter Solstice in 2012 – but 13 was a magic number to Mayans so it seems more likely that instead of going beyond 13 they would just have started over.
The Norse were a lot more serious. They blew up stuff when Ages ended.
Read the whole thing, if only for the cool graphics of the constellations.