
Experts review prophecies about the Mayan calendar and the significance of Dec. 21, 2012.

People speak of a potential cataclysm on Dec. 21, 2012.

A family prepares for the Hopi apocalypse.

Prophets with visions of doom include Nostradamus, Edgar Cayce, Joseph Smith, and St. Malachy; doomsday preparation.

Science fiction terrors threaten to become real; zombie apocalypse.