常速英语

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SPEAKER: From zebra stripes, to cracked mud, to honeycombs, patterns abound in nature. Are these patterns just pleasing to the eye or do they reveal something about biological processes? ...

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Vaccines are medicines that train the body to defend itself against future disease. Unlike other drugs, which we give to some people when they’re sick, we give vaccines to huge numbers of people wh...

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NARRATOR: African savannas are famous for their diversity of large mammals. But how do so many similar species coexist in the same place? Princeton University biologist Rob Pringle i...

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A war has been raging for billions of years, killing trillions every single day, while we don't even notice. The war is fought by the single deadliest entity on our planet: the bacteriophage ...

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So termites build these huge, huge mounds. And inside the mound, there's a great deal of activity that's going on. So termites go out. They forage for plant material, which they find in actual...

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Viruses are tiny infectious agents that dominate much of the microscopic world. They’re incredibly abundant. There are more viruses in a single drop of seawater than there are people living in New ...

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KEN DIAL: The evolution of flight in birds has long been a great scientific puzzle. Fossil evidence from the past 40 years has established that birds descended from theropods-- a linea...

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Black holes are the largest collections of pure violent energy in the universe. If you come too close, they'll devour you and add your energy to their collection. And so, the energy is lost to u...