常速英语

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Is there a border we will never cross? Are there places we will never reach, no matter how hard we try? It turns out, there are. Even with sci-fi technology, we are trapped in a limited ...

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Walking on two legs marked a huge change for our species. In fact, being almost exclusively bipedal makes us unique among our primate cousins. The question is, how did our ancestors start...

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What would happen if we were to detonate a very very powerful nuclear weapon on the moon? Would the explosion knock its orbit towards earth, causing tidal waves and misery? Could the moon be d...

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>> Studying the DNA of ancient organisms is a window into our distant past and if you look hard enough you can find some creatures today that haven't changed much in hundreds of millions ...

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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...