单词：branching of polymer chains
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Armani is known all across the world for being a leader in style. The Italian fashion house was founded by legendary designer Giorgio Armani in 1975. It is today one of the fashion worlds most prestigious names. It produces a wide range of clothes, a
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This is Scientific American's 60-Second Science. Im Cynthia Graber. This will just take a minute. Buildings consume about a third of the energy and two-thirds of the electricity in the U.S. Roofs are a good place to try to cut those figures. Because
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This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute?. [Spray sound.] Killing bugs? No. [Spray sound.] Deodorizing the bathroom? No. [Spray sound.] Checking for explosives, yes. Because chemists at the University of Califor
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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Solar cells convert sunlight to electricity. But they don't take advantage of all that solar heat, thereby missing out on the majority of the solar ene
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Breaking the chains ~演唱者：dokken (dokken, lynch) Sit there thinkin' In your room You feel the pressure You're goin' crazy too The walls around you Closin' in You need a change Claustophobic Feelin' scared You need somebody But no one seems to
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Can I Come Down Now? 现在我可以下来了吗？ As one of natures top predators, the tiger is not an animal that we would ordinarily think of as being chicken. However, one tiger, which lives in an English zoo, turned out to be more cowardly than
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