Astronaut M B spent 199 days on the international space station in 2009.On Feb. 17th 2013, he told kids about his time in space as part of Family Science Day Effort on the Annual Meeting of American Association for the Advance of Science in Boston.Qu

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Sorry,there is not text temporarily, Please help tingroom to look for it! 如果您能找到更好的听力原文，请发贴到听力原文收集区，您将会获得10到30积分的奖励! Thank you！

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This is Scientific Americans 60 second Science, I am Sophie Bushwick, got a minute? Comparisons of different animals have shown that larger brains provide greater intelligence, but they also guzzle more energy and have other consequences. Now scienti

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Medicinal tablets are nothing new. Doctors have been dispensing pills for thousands of years. Now, archaeologists have turned up some of those ancient medicines which were preserved in a shipwreck for close to two millennia. The 2nd centry Pozzino wr

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When normal population of healthy bacteria in the gut get out of whack, the result can be the stubborn and recurrent bacterial infection known as Clostridium Difficile, C Dif. The mean symptom is nearly constant and debilitating diarrhea. One of the

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This is Scientific Americans 60 second Science, I am Gretchen Kuda Kroen, this will just take a minute. When normal populations of healthy bacteria in the gut get out of whack, the result can be the stubborn and recurrent bacterial infection known as

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This is Scientific American 60 second Science, I am Karen Hopkin, this will just take a minute. There are in fact 100 billion galaxies, each of which contains something like a 100 billion stars. Well, Carl Sagan would have loved to get the latest est

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