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听力文摘：外星人来电
E. T. Phoned. Now What? 外星人来电 Suppose one day scientists pick up a transmission they think is generated by aliens. Now what? Do we build a landing strip and break out the welcome wagon? 假如有一天，科学家收到到外星人发来的信
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听力文摘：蚕丝
Silk 蚕丝 Silk is the strongest natural fiber in the world, as far as we know. Scientists long to understand just how exactly the silkworm manages the process of silk weaving, so they can replicate the process in order to manufacture such things as
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听力文摘：巴克敏斯特·福乐和他的球型屋顶
Buckminster Fuller and His Geodesic Dome 巴克敏斯特福乐和他的球型屋顶 Ever heard of a man named Buckminster Fuller, or Bucky, as his friends called him? R. Buckminster Fuller was a twentieth century scientist, philosopher, inventor, and
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听力文摘：植物大战毛毛虫
If you have kids, youve probably read the children's book: The Very Hungry Caterpillar, see, at least five thousand times. If you havent had the pleasure, heres a brief plot summary. A caterpillarhatches from a small, white egg. Extremely hungry, the
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听力文摘：乱跑的细胞
A major reason why many cancers are so dangerous is that they metastasize. This means that instead of staying in one place, the cancer cells migrate from their original site to other parts of the body. No wonder that scientists are busy studying the
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听力文摘：你家有"鼻涕虫"吗?
As anyone who's had a toddler knows, they're incredibly demanding creatures. Armed with an insatiable desire to eat and/or destroy just about everything in their path, these walking embodiments of unchecked ego can be a handful. Especially when they
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听力文摘：忍辱负重的"女系部族"
Males Rule in Costa Rican Wasp Species 哥斯达黎加父系制度的黄蜂 In most species of social insects, such as wasps, bees, and ants, the females rule. The females are the workers. They are the ones to go out and get the food, and they are al
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听力文摘：人人都会读心术
Mind Reading 读心术 Sometimes we get letters here asking whether psychics are for real. Well, despite the t.v. shows, there isnt any scientific evidence that psychic powers, such as mind-reading, actually exist. That doesnt prove they dont existju
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听力文摘：乐观主义好处多
Research shows that whether a person is an optimist or a pessimist is related to their quality of life, including their physical health. The subjects involved first took personality tests in the 1960s and then thirty years later they completed a foll
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听力文摘：为什么嘴唇会干呢？
Why lips go dry？ 为什么嘴唇会干呢？ Lets start by reviewing the ways in which the surface of our lips is different from the surface of the skin on the rest of our bodies. Basically, our lips are made of the same mucusmembrane that coats th
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听力文摘：狗最懂人的缘由
Point at a ball and a dog will look at the ball, whereas a cat will probably look at your hand. Dogs seem to have a ready understanding of how human beings direct attention by pointing, and can follow our gestures almost as if they thought the same w
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听力文摘：管状胶带和疣
Duct Tape and Warts 管状胶带和疣 Have you ever used duct tape to tape a duct? Do you even know what a duct is? Maybe not. But you definitely know what duct tape is, and youve probably used it to fix everything from glasses to flashlights. Now,
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听力文摘：老年痴呆还能预防?
The prefrontal cortex is the region of the brain located just behind the forehead, where higher-level cognition occurs, such as recalling whether a word was heard aloud or read. Most people show evidence of more processing on one side of the cortex,
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听力文摘：发笑的触发器在哪里?
Did you ever wonder what occurs inside your body when something funny happens? What is this thing we have in our brains that makes us say ha-ha when someone slips on a banana? 你有没有想过当一些有趣的事情发生的时候，你身体内部会
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听力文摘：狗比猫更懦弱?
Have you ever noticed that while its pretty easy to tell your dog is sick, its much harder to know how your cat or bird are feeling? Well, before you start asking your dog why it cant be more stoic like animals half its size, its probably worth consi
