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 study reveals that well-timed bursts of pink noise can nudge a person's brain waves, extending periods of slow-wave, or deep, sleep. And toddlers learning new words show that taking even a short nap after learning something new can help the information stick. And when it comes to sleeping poorly, it may turn out that having interrupted sleep can be just as harmful as missing sleep altogether. As scientists come to understand the powerful role that sleep -- or lack of it -- plays in everything from memory to trauma to emotion regulation, one thing is clear: This biological function is as crucial as it is complex.
勇敢无畏的乌利·史戴克和丹尼·阿诺专攻高山,这次两人挑战瑞士阿尔卑斯山大北壁,比拼谁能创下最速纪录。
2025年故宫博物院迎来建院百年,本片通过新华社记者张扬的视角,记录这座从帝王宫殿走向人民博物馆的紫禁城在百年节点上的全新面貌:镜头见证数字技术让文物跨越宫墙栖身方寸屏幕,追踪文物修复师在科技与传承间延续文明血脉,追寻一代代故宫人从守护宫殿到重塑文化价值的思考轨迹,展现故宫IP以多元姿态焕发新生机的当代实践。这不仅是⼀场百年庆典的序幕,更是⼀场关于⽂明守护、价值重⽣与未来连接的深刻对话。
地球上的生物物种具有多样性。直到21世纪初,人类已知的昆虫有100余万种,但仍有许多种类尚待发现。昆虫种类繁多、形态各异,属于无脊椎动物中的节肢动物,是地球上数量最多的动物群体,在所有生物种类中占了超过50%,它们的踪迹几乎遍布世界的每一个角落。比如生活中最常见的蜜蜂、黄蜂、甲虫、瓢虫、蜻蜓等,本系列纪录片以引人入胜的叙事方式,主要讲述了大自然中各种常见的昆虫的生活,让我们一起来欣赏吧。