科学研究   

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The world we live in feels normal, ordinary. It feels like this is just how humans exist and always existed. But, it's not. Never before have we humans lived in a world as sophisticated and enginee...

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David Relman. He came in from Stanford University where he is an associate professor of microbiology and immunology and an assistant professor of medicine in the division of infectious diseases.The hu...

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[NARRATOR:] The DNA double helix contains two sequences of nucleotide code letters that run along the molecule. Untwist the spiral, and DNA can be seen as two parallel strands. That'...

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The physics of sneezes is at the heart of understanding how pathogens of one individual become the pathogens of another. So without that step of transportation of the pathogens from one host to th...

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Hi Trisha. How are you? Gura: Hi Steve. Steve: Good to see you. Tell me—first of all, the book is called Lying in Weight, w-e-i-g-h-t. Gura: That's correct. Steve: What does the title mean? Gura:...

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A lot of things can be beautiful. Landscapes, faces, fine art, or epic architecture; stars in the sky. Or simply the reflection of the sun on an empty bottle. Beauty is nothing tangible, it only ex...

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Wilson: Let me say about this morning, this—in my long career—this is the one morning when I think I took part in making history. That sounds like poor belief, but I am going to justify that in a mome...

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The structure of DNA that Watson and Crick discovered suggests how genetic information is passed on. Before a cell divides the double helix unwinds and the two strands of the DNA molecule in the nucle...