月亮的秘密

视频简介

Lost Worlds takes viewers on a global exploration of the fascinating interconnectedness of all living things. Leap off the top of Angels Falls| the highest waterfall in the world, dive into active volcanoes and climb to the top of tropical rain forest to participate in the epic story of biodiversity and its profound importance to human life.。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 ...。