常速英语

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ANTHONY BARNOSKY: Species do not last forever. You can think of species a lot like you think of a human lifetime. They have a beginning and they have an end. SPEAKER 1: Anthony Barnosky...

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The sars cov2 coronavirus has been acquiring random mutations ever since it jumped from animals into humans. In recent weeks several new variants on the original have been spotted. These appear ...

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Corals are small animals, but they build structures that you can actually see from space. And as we zoom in we see the reefs where I work on a little island called Ofu in American Samoa, ...

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Until recently, the vast majority of the world population worked on farms and the total production of the world's economy was mostly the total agricultural output. And this output was limited...

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On the internet, the algorithms are all around you. You are watching this video because an algorithm brought it to you (among others) to click, which you did, and the algorithm took note. Whe...

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Imagine NASA announced today that they found aliens. Bacteria on Mars, weird alien fish in the oceans of Europa, and also ancient alien ruins on Titan. Wouldn't that be great? Well, no. ...

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Homeopathy may be the most controversial but also the most popular alternative medicine. While some argue against it, others swear by its great power and effectiveness. How does homeopathy work?...

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There's a cross-section of that sort of tower, which is known as a villus. And the villus is lined by cells on the outside that are the fully differentiated cells that play an important...