NASA's recruits several scientists and historians to debunk theories that December 21, 2012 marks the end of the Mayan calendar. "The whole thing was a misconception from the very beginning." explains Dr. John Carlson, of the Center for Archaeoastronomy. No Mayan legends predicted the end of the world, he adds.
And if you're worried about a "Deep Impact" or "Armageddon" type scenarios, NASA's video tells us not to worry: "No known asteroids or comets were a collision course with earth."
Knock on wood, NASA.