[TheBattman]

Mayan's predicted the end of the world by ending their calendar on Dec. 21, 2012

No they didn't - their calendar is a cycling calendar - it just starts over. That is why it is depicted as a circle - when it "runs out", you start it again.

[sodpoodle]

********their calendar is a cycling calendar - it just starts over*****

Help me out here....how did the Mayans figure out BC and AD before Christ was born???