Earth teems with a staggering variety of animals, including 9,000 kinds of birds, 28,000 types of fish, and more than 350,000 species of beetles. What explains this explosion of living creatures—1.4 million different species discovered so far, with perhaps another 50 million to go? The source of life's endless forms was a profound mystery until Charles Darwin brought forth his revolutionary idea of natural selection. But Darwin's radical insights raised as many questions as they answered. What actually drives evolution and turns one species into another? To what degree do different animals rely on the same genetic toolkit? And how did we evolve? "What Darwin Never Knew" offers answers to riddles that Darwin couldn't explain. Breakthroughs in a brand-new science—nicknamed "evo devo"—are linking the enigmas of evolution to another of nature's great mysteries, the development of the embryo. NOVA takes viewers on a journey from the Galapagos Islands to the Arctic, and from the explosion of animal forms half a billion years ago to the research labs of today. Scientists are finally beginning to crack nature's biggest secrets at the genetic level. The results are confirming the brilliance of Darwin's insights while revealing clues to life's breathtaking diversity in ways the great naturalist could scarcely have imagined.

目睹黄石公园的壮丽与土狼生存的险境… 一头小土狼被赶出了狼群，它必须在黄石国家公园这个既美丽又危险的蛮荒地带，学习如何生存...当这头名叫凯因的小土狼展开了它的旅程，它将在这块享有美洲塞伦盖提之誉的地方，遭遇大批各式各样的野兽。 目睹了黄石公园里四季分明的天然美景，从冬天的冲天气泉到夏日的熊熊烈火，凯因一年来艰辛和胜利的冒险旅程，最后以与自己出身相同狼群间的生死对决做为结束的高潮。藉由美国国家地理学会制作的《黄石公园》，您将亲身体验这壮丽无比的大自然景观。