21 年前
视频简介
巴里·艾伦穿越时空回到过去去拯救自己的母亲，但是未来的自己阻止了他。当他回到现在，此时虫洞已经为了第二次穿越时空而重新打开，来自平行世界的极速与巴里展开的对决，极速也道出了他不远万里穿越平行宇宙追杀闪电侠的缘由：为了让自己成为所有宇宙中唯一的极速行者。。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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