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听力文摘：冻结的一瞬!
Freeze 冻结的一瞬 Suppose you are an animal. Well, actually, you are an animal, but suppose youre another kind of animal, maybe something small that might make a tasty snack for a larger predator. 假设你是一只动物。额，你其实本来就
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听力文摘：穴居人怎样抵抗疾病
How Neanderthals Fought Disease 穴居人怎样抵抗疾病 Every year people are encouraged to get their annual flu shots. Signs are posted at drug stores and clinics. Get your shots here. Modern preventive medicine has saved millions of lives. But
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听力文摘：为什么斑马身上有条纹？
Why Do Zebras Have Stripes? 为什么斑马身上有条纹？ For many animals, camouflage is an important part of survival. A leopards spotted coat and a polar bears white fur help them blend into their respective environments. 对于很多动物来说
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听力文摘：大陆相撞：我们星球的历史
When Continents Collide: The History Of Our Planet 大陆相撞：我们星球的历史 It was one of the Earth's momentous times. Continents collided. Volcanoes erupted. Ocean currents shifted. Species ran amok. 这是地球意义非凡的时刻之一
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听力文摘：中年发福伤不起
The Mathematics Of Middle-Age Spread 中年发福伤不起 Let's say you're an 18 year old male who runs every other day, logging 12 miles a week. 假设你是一个18岁的男性，每隔一天就会跑步，算下来每周会跑12英里。 Now fast
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听力文摘：缓慢的生存
Survival Of The Sluggish 缓慢的生存 Silkworms have been bred over thousands of years to behave quite unlike their caterpillar cousins in the wild. That's because people purposely breed silkworms to fit this job description: 蚕这种动物已经被
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听力文摘：蚕丝生产的秘密
Secrets Of Silk Production 蚕丝生产的秘密 Fifteen hundred years ago in China, silk production was a state secret. 在1500年前的中国，蚕丝的生产方法是国家机密。 The silk trade was so valuable that anyone who tried to take sil
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听力文摘：曾经的山顶洞人
Sometime Cavemen 曾经的山顶洞人 From the bestselling novel Clan of the Cave Bear to the 1981 movie Caveman, pop-culture tends to misrepresent prehistoric people as cave dwelling brutes. But even the most speculative recreations of early human
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听力文摘：为何冰箱会发出声音？
Why refrigerators hum? 为何冰箱会发出声音？ Why refrigerators hum，on toay's moment of science.On the recent program we have discussed how fluorocarboncoolant cools your food by coming to a boil in coils hidden in your fridge. 今天的科学
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听力文摘：有一种沸腾能冷却你的食物！
The Rolling Boil That Cools Your Food 有一种沸腾能冷却你的食物！ When you think of something boiling, you probably picture a pot on the stove, but there's another kitchen appliance that brings liquid to a boil, not to heat food, but cool
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听力文摘：水下的朦胧世界
The Blurry World Underwater 水下的朦胧世界 When you open your eyes underwater, things look blurry, but with goggles, everything looks perfectly clear. Why can't we landlubbers focus underwater without goggles? 当你在水底睁开眼睛的时候
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听力文摘：为什么天空不是统一的蓝色
Why The Sky Is Not Blue 为什么天空不是统一的蓝色 Look at various parts of the sky on a clear day and you will see that it is not a uniform blue. Even if the sky is deep blue when you look straight up, near the horizon it is lighter. 抬头仰
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听力文摘：夜视：人类为何看不见颜色？
Night Vision And Humans: Why Can't We See Color? 夜视：人类为何看不见颜色？ When we are in a fairly dark room, or outside at night away from lights, we can still see, but we can't see the colors of things very well. Why is that? 当我们在
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听力文摘：为何高尔夫球上有小窝？
Why Do Golf Balls Have Dimples? 为何高尔夫球上有小窝？ You're out on the golf course one pleasant afternoon. Your ball is set on the tee. You lean over the ball. You grip the club just right. 在一个舒适的下午，你站在高尔夫球场
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听力文摘：迷幻蘑菇会让人性格更好吗？
Do Magic Mushrooms Make People Nicer? 迷幻蘑菇会让人性格更好吗？ Ive heard that psilocybin, which is the hallucinogenic ingredient in psychedelic mushrooms, can alter people's personalities and make them nicer. Is that true? 我听说裸头
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