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词汇量测试当前位置: 首页>听力教程>Scientific American's Sixty>2011年Scientific American's Six>Scientific American(八)月>
  • SSS 2011-08-31

    This is Scientific American's 60-Second Science. I'm Christopher Intagliata. Got a minute? Handwashing is the best way to avoid spreading infection, according to the CDC. But doctors, nurses and hospital staff wash up less than half as often as they...

  • SSS 2011-08-30

    This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Smart phones can provide music, movie times, bus schedules. They can even make phone calls! And now, they might help cut down fuel use while driving. T...

  • SSS 2011-08-29

    This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Many scientists draw their concepts.For example, if we look at the work of somebody like Maxwell or Faradywe know they drew as part of their inventing...

  • SSS 2011-08-26

    This is Scientific Americans 60-SecondScience, Im Christopher Intagliata. Got a minute? Historians have speculated for years thatglobal environmental changes caused some ancient wars to erupt, or evensocieties to collapse. Such connections may still...

  • SSS 2011-08-25

    This is Scientific Americans 60-SecondScience. Im John Matson, got a minute? Say you need a diamond. You could go downto the jeweler, or you could put some carbon deep underground and let it sitfor a couple billion years. Or you could hop in a starsh...

  • SSS 2011-08-24

    This is Scientific Americans 60-Second Science. Im Christopher Intagliata. Got a minute? Rivers today have high muddy banks, sandbars and bends. But they didnt always look that way because it wasnt until the evolution of tree-like plants, some 330 mi...

  • SSS 2011-08-23

    This is Scientific Americans 60-Second Science. Im Steve Mirsky. Got a minute? To be honest with you, I didnt feel a thing. But many other Scientific American staffers felt the shaking a few minutes before 2 P.M. Eastern time. After checking Twitter...

  • SSS 2011-08-22

    Most large animals have to chew food extensively and form it into a mushy ball that's easy to swallow. Cooking makes a huge differenceit softens the food and dramatically reduces eating time. Researchers calculated that if we lived like our non-cooki...

  • SSS 2011-08-19

    Some graduate students in science, technology, engineering and mathor STEMonly do research, under the guidance of a mentor. Other STEM grad students also have teaching responsibilities, for example, instructing undergrads or local high schoolers. Now...

  • SSS 2011-08-18

    This is Scientific Americans 60-SecondScience. Im Steve Mirsky. Got a minute? The traveling salesman problem is afavorite math conundrum: if a salesman has to visit a bunch of cities, how doyou get him to all of them once via the shortest possible ro...

  • SSS 2011-08-17

    This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute? When a healthy rat smells a cat, it flees. But rats infected with the Toxoplasma brain parasite actually follow cat odors, often presumably to their doom, red in tooth a...

  • SSS 2011-08-16

    This is Scientific American's 60-Second Science. I'm Katherine Harmon. Got a minute? Some 50 million Americans 65 and older currently get help from Medicare. But the program doesn't cover all of the patient's medications. After a patient's annual dru...

  • SSS 2011-08-15

    This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Conventional poultry farms use antibiotics extensively, which contributes to the rise of antibiotic-resistant pathogens. But farms that turn to organic...

  • SSS 2011-08-12

    This is Scientific Americans 60-Second Science. Im Sophie Bushwick. Got a Minute? What's the best way to find out if an unknown mixture contains a specific substance, like an environmental contaminant? You could use an expensive, bulky gas chromatogr...

  • SSS 2011-08-10

    Invasive species get a bad rapbut we humans are usually to blame for their spread. Take Japanese stiltgrass, an invasive that arrived from Asia nearly 100 years ago as a packing material for porcelain. When it creeps into forests, it forms dense carp...

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