视频简介
An epic, visually stunning series based on the critically acclaimed novel by one of the most popular Russian authors, Alexei Ivanov, combining historical drama with mystery and fantasy. The 15th century. Sent from Moscow, Prince Yermolay wants to unite all peoples of Perm, Christians and pagans alike. To do so, he, a Christian, seizes the pagans' most powerful artefact, the Gol...。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 ...。