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 ...。U.S. Marshal Raylan Givens is a modern day 19th century-style lawman, enforcing his brand of justice in a way that puts a target on his back with criminals and places him at odds with his bosses in the Marshal service. That conflict results in a reassignment for Givens to the U.S. District covering the town where he grew up. He is an anachronism - a tough, soft spoken gentleman...。
