含中文字幕节目   

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In 2007, Margaret Ann Gordon went to walk her dog. She was living in Bulgaria. As she was walking, a group of seven or eight dogs ran towards her. No one owned these dogs. They lived on the city stree...

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One was short, fat and famously ugly; the other was handsome, slim and very tall indeed, with tumbling dark curls caught back in a headband. One skulked about in a grubby robe and sandals; the other s...

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Steve: What are the some of the, well, you talk about fur. I mean, I remember when this whole world started, I used to always hear people talk about how difficult it was to do water. But when you're d...

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Like all young mammals, human infants depend on milk for nutrition. Milk is rich in lactose, a disaccharide made from two sugar molecules. Lactose cannot be directly absorbed in the small intestine. T...

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The decision to go to the moon was made in May,nineteen sixty-one.President John Kennedy set the goal in a speech to Congress and the American people."I believe that this nation should commit itself t...

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The majority of the civilian soldiers of the Western democracies, by contrast, just wanted to survive and return to normal life as soon as possible. That also meant that American and British generals ...

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(excerpts from Ice Age movie) The biggest event in two million years is about to go to a whole new dimension. voice 1: Nobody move a muscle. voice 2: We've been living above an entire world and we ...

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Mutations arise at random in a population. Suppose a mutation arises that causes adults to produce lactase in a population that doesn't have any dairy cows. Adults don't drink milk, so producing the l...