Is the world going to end in 2012?

There is a theory going around that the Mayan calender only goes up to 2012 because the world will end then
Update: I have noticed that some here think that I believe the theory. It was a question I hoped would interest others. I did use the word' theory' I did not say I believe this stuff, however the answers are very interesting, and so are some of the theories!
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