The Mayan calendar is ending on Dec. 21, 2012, not the world. No calendar is infinite, and all of them are based on increments of time observed and enforced by humans. But how can I know this isn't the right one? Because every other doomsday prediction before it was also wrong. The only 'end of the world' prediction that has any weight to it is the day that our sun swells into a red giant (before it begins to die) and consumes the first four planets in our solar system. This, however, won't happen for billions of years and humans will likely be extinct by then. Whatever kills us, be it a meteor, nukes or global warming, no one has predicted down to a specific date.
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