常速英语

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Black holes are the most powerful and extreme things in the universe and they are wildly weird and complicated. What would happen if you fell inside one and what are they really? First we need...

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[ Music ] >> You may think you have nothing in common with a creature that lives under water. But at some point in the distant past all mammals shared a common ancestor and that ancest...

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By using one of the most complicated and powerful machines on the planet, scientists have found a way to glimpse back to the very beginning of time itself. This time machine is a particl...

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>> So your back's a real pain. Turns out many back problems are the result of our ancestors' transition from walking on four legs to walking on two. The earliest primates lived in trees...

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The night sky seems peaceful and orderly. But in reality, stars are careening through the galaxy at speeds of hundreds of thousands of kilometers per hour. Not bound by static formations but ...

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[Background Music] >> I mean it's hard not to look at these guys and feel a deep connection. When you look in their eyes, when you see their hands, when you see their little nails, how ...

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In and out, in and out. Staying alive is about doing things. This very second, your cells are combusting glucose molecules with oxygen to make energy available, which keeps you alive for anothe...

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>> So when you eat, I bet you're not thinking about your inner monitor lizard. But teeth like ours do show up in the fossil record from the time when our ancestors kind of looked like rept...