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中国奇书《推背图》是唐初李淳风与袁天罡合撰，预言历代变革之事，准确灵验。唐太宗翻看此书后，大为赞赏，重赏李淳风，袁天罡因妒忌李淳风夺其功，怀恨在心。太宗死后，两人更将《推背图》图、文分家，两家成为世仇。而《推背图》从此绝迹民间。数百年后，两家后人阴差阳错结成夫妇……。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 ...。
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