科学研究   

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Steve: Dr. Marantz, good to talk to you today. Marantz: Hi, Steve. Steve: Very interesting paper you have here, "A Call for Higher Standards of Evidence for Dietary Guidelines." Let's cut right ...

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A, C, G, and T. Adenine, cytosine, guanine, and thymine. These are the four chemical building blocks of the DNA molecule. They are components of nucleic acid, which gives DNA its ton...

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Squyres: Spirit is now hunker[ed] down due to winter. Spirit is deep in the southern hemisphere of Mars and what that means is winter is pretty tough, and so what we've done is we have parked the vehi...

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Have you ever been in an argument about nuclear power? We have, and we found it frustrating and confusing, so let’s try and get to grips with this topic. [Intro] It all started in the 1...

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Steve: Hi Dr. Gaby, how are you? Gaby: I'm very well, thanks Steve. Steve: Enjoying the cruise? Gaby: I am having a terrific time. Yeah, this is too much fun. It's going to be hard to go home...

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So at equilibrium, at your normal weight, leptin is made and you're eating different types of food. Now let's imagine you were starving or you went on a diet, your fat mass would contract ...

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The Universe is incredibly big and seems full of potential for life, with billions of habitable planets. If an advanced civilization had the technology to travel between the stars, at just 0.1% of ...

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Simon: We have a theory right now called cold dark matter, which describes the structure of the universe on large scales and how galaxies form within that structure; and so when you look at the univer...