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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 ...。THE DARK MONEY GAME films investigate the shadowy world of political donations and fundraising 15 years after the Supreme Court’s decision in the Citizen’s United case, which enabled unlimited spending by hidden sources on many political campaigns. The project is inspired by Jane Mayer’s book “Dark Money: The Hidden History of the Billionaires Behind the Rise of the Radical Rig...。