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《一堂好课》是《开讲了》的升级版，节目邀请行业名人授课，新生代明星作为课代表与高校学生一起听课，代表学生提问并与学生一起动手实践。。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...。