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[時(shí)差N小時(shí)] 時(shí)差N小時(shí):北冰洋的淡水湖憂患(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 i2012-02-06 編輯：beck
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[時(shí)差N小時(shí)] 時(shí)差N小時(shí):北冰洋的淡水湖憂患(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 fres2012-02-03 編輯：beck
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[時(shí)差N小時(shí)] 時(shí)差N小時(shí):為何月球上沒有餐廳(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 so2012-02-02 編輯：beck
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[時(shí)差N小時(shí)] 時(shí)差N小時(shí):為何月球上沒有餐廳(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 mi2012-02-01 編輯：beck
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[時(shí)差N小時(shí)] 時(shí)差N小時(shí):熱量動(dòng)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 nail2012-01-31 編輯：beck
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[時(shí)差N小時(shí)] 時(shí)差N小時(shí):熱量動(dòng)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 metal2012-01-30 編輯：beck
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[時(shí)差N小時(shí)] 時(shí)差N小時(shí):果實(shí)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 t2012-01-20 編輯：beck
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[時(shí)差N小時(shí)] 時(shí)差N小時(shí):果實(shí)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 beco2012-01-19 編輯：beck
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[時(shí)差N小時(shí)] 時(shí)差N小時(shí):喝尿是安全的嗎?(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 would2012-01-18 編輯：beck
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