20 年前
视频简介
NOVA: Mysteries of Sleep Like virtually every other animal, humans need sleep to survive. But why? What do we gain from spending nearly a third of our lives in such a defenseless state? And what's at stake if we sleep poorly? The functions of sleep have long been something of a mystery. But now scientists are peering deep into the brain to see what happens while we snooze. One ...。《快乐向前冲》已经成为了网络红人的造星工厂。谁是民间体能达人？不管你是生活小人物，还是体育全能王，只要你有足够勇气挑战自我，你就能成为2009年万众瞩目的耀眼明星。。
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