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A down-on-his-luck farmer makes a deal with the devil for seven years of prosperity. When Mr. Scratch comes to collect, orator and hero of the common man Daniel Webster comes to the rescue. Based on the short story by Stephen Vincent Benet. Also known as "All That Money Can Buy."。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 ...。