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  • [时差N小时] 时差N小时:耳石(上)

    Ear rocks, also known as otoliths, are tiny pebbles of calcium carbonate in our inner ear that help keep us balanced. They’re located deep inside the inner ear in a small pouch called a utricle

    2012-02-09 编辑:beck

  • [时差N小时] 时差N小时:昆虫的世界(下)

    Here’s how Knab explained it: males gather around some landmark—a cornstalk, perhaps the head of an unsuspecting human–and wait for eligible females. When a female enters the swarm, the

    2012-02-08 编辑:beck

  • [时差N小时] 时差N小时:昆虫的世界(上)

    Have you ever walked into a swarm of insects—gnats, mosquitoes, or one of their many cousins–and then found yourself unable to shake the swarm? You fake left, go right, but the little buggers

    2012-02-07 编辑:beck

  • [时差N小时] 时差N小时:北冰洋的淡水湖忧患(下)

    Most marine organisms are adapted to the ocean’s salt concentration. Just as humans cannot drink saltwater, plankton and other small marine creatures floating with the currents cannot survive i

    2012-02-06 编辑:beck

  • [时差N小时] 时差N小时:北冰洋的淡水湖忧患(上)

    An ocean is the last place you’d expect to find a freshwater lake. As strange as it may seem, the Arctic Ocean is home to a lake roughly twice the size of Lake Victoria, one of the largest fres

    2012-02-03 编辑:beck

  • [时差N小时] 时差N小时:为何月球上没有餐厅(下)

    But more than these kinds of natural processes are needed to have an atmosphere. You also need gravity. Without sufficient gravity, any gases will just leak out into space and be gone. Earth loses so

    2012-02-02 编辑:beck

  • [时差N小时] 时差N小时:为何月球上没有餐厅(上)

    Why are there no restaurants on the moon? Great food. No atmosphere. The atmosphere is the layer of gases that surrounds a planet or other massive body. Although our atmosphere extends for tens of mi

    2012-02-01 编辑:beck

  • [时差N小时] 时差N小时:热量动能(下)

    Take two nails and scrape them together vigorously. Now touch the place you were scraping. It’s hot! Let them cool and try it again. It’s hot again! You could do this all day and the nail

    2012-01-31 编辑:beck

  • [时差N小时] 时差N小时:热量动能(上)

    At one time it was believed that heat was a liquid. Sure, that sounds kind of crazy, but if you think for a second, you might see why. Suppose you have an object that’s very hot — say a metal

    2012-01-30 编辑:beck

  • [时差N小时] 时差N小时:果实成熟(下)

    Plants attract fruit eaters,or frugivores–by packing valuable resources into their fruits like sugar and water or important nutrients such as carotenoids, vitamins and minerals. Plants often t

    2012-01-20 编辑:beck

  • [时差N小时] 时差N小时:果实成熟(上)

    Usually a green, sour fruit is just a fruit that’s not ripe yet. If you left a lime on the tree longer would it eventually change color and become sweet, like an orange? Actually, limes do beco

    2012-01-19 编辑:beck

  • [时差N小时] 时差N小时:喝尿是安全的吗?(下)

    But if you kept recycling urine by urinating and drinking it multiple times, wouldn’t those minerals eventually build up until the urine was no longer safe? Over several days, your urine would

    2012-01-18 编辑:beck

  • [时差N小时] 时差N小时:喝尿是安全的吗?(上)

    Time go again to the A Moment of Science mailbag. A listener writes: Dear A Moment of Science, Is it OK to drink urine? Not that I want to, I’m just curious. Well, the short answer is yes if yo

    2012-01-17 编辑:beck

  • [时差N小时] 时差N小时:咖啡渍的奥秘(下)

    Why is that? It’s because the edges of the spill are where the fluid is at its thinnest. A spill sitting on a flat surface is something like a pancake. Big in the middle and thin on the rim. As

    2012-01-16 编辑:beck

  • [时差N小时] 时差N小时:咖啡渍的奥秘(上)

    Next time you spill a little, let the coffee dry before wiping it up. You’ll notice that after it dries there is a darkish ring around the very edge of the spill, whereas the middle disappears

    2012-01-13 编辑:beck

  • [时差N小时] 时差N小时:戒烟的最好办法(下)

    However, the effect was short lived. Within three months, both groups of callers were more or less equal when it came to how many had remained smoke-free. The researchers are optimistic, though, that

    2012-01-12 编辑:beck

  • [时差N小时] 时差N小时:戒烟的最好办法(上)

    We all know that smoking is unhealthy. But what’s the best way to get someone to quit? By harping on the dangers of lighting up, or by touting the benefits of kicking the habit? According to on

    2012-01-11 编辑:beck

  • [时差N小时] 时差N小时:少吃盐对健康有益(下)

    But it’s worth trying to eat less. In one study, researchers used computer models to see how less salt could affect teens’ health. One result showed that reducing salt consumption by as l

    2012-01-10 编辑:beck

  • [时差N小时] 时差N小时:少吃盐对健康有益(上)

    I know it’s a good idea for adults to watch how much salt they eat, especially if they’re at risk for high blood pressure. But what about kids? Should parents cut back on how much salt th

    2012-01-09 编辑:beck

  • [时差N小时] 时差N小时:基因"食谱"(下)

    No matter what your cell was doing before, it will stop its healthy functioning and make only viruses, following the viral recipe until it runs out of raw materials. Then your once healthy cell burst

    2012-01-05 编辑:beck