视频简介
It was the world's last Islamic empire - a super-power of a million square miles. From its capital in Istanbul it matched the glories of Ancient Rome. And after six centuries in power it collapsed less than a hundred years ago. Rageh Omaar sets out to discover why the Ottomans have vanished from our understanding of the history of Europe. Why so few realise the importance of Ot...。品尝墨西哥街头美食，开启风味探索之旅。在这里，不起眼的卡纳是绝对的主角，每一口都能引发热议并收获众多粉丝。。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 ...。