『教室的那一间第5集免费观看』介绍:The Mayan calendar predicts that the world will end in 2012, and many believe it's true. This Emmy-nominated Discovery Channel documentary illustrates the variety of ways the apocalypse could arrive in. True believers will learn how volcanic eruption, widespread plague, deadly asteroids, neighboring stars, and nuclear and biological weapons could each bring about the extinction of humankind.