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时差N小时:钻石的年龄(上)
You walk into a fancy party. What is the oldest thing there? No, not your in-laws, or even your grandparents. It will be a diamond someone is wearing. It’s not completely clear how natural diam2011-12-20 编辑:beck 标签: 我来听写
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时差N小时:为何孕妇需要远离交通繁忙区域?(下)
It’s not clear why, exactly, heavy traffic could cause premature birth. Air pollution from car exhaust could have something to do with it. Some studies have found that women exposed to high lev2011-12-19 编辑:beck 标签: 我来听写
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时差N小时:为何孕妇需要远离交通繁忙区域?(上)
Ideally, pregnant women should do everything they can to have a full term pregnancy, because babies born even a few weeks early risk being less healthy and possibly suffering from long term disabilit2011-12-16 编辑:beck 标签: 我来听写
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时差N小时:风力发电机(下)
Turbines with one or two blades are actually even more efficient. But because they’re also lighter and tend to spin faster, they’re also noisier. These designs also require a special tilt2011-12-15 编辑:beck 标签: 我来听写
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时差N小时:风力发电机(上)
If you’ve ever driven by a wind farm, you may have noticed that the turbines most likely have three blades. Not two, not five, but three. Now, you may think that if the point of a wind turbine2011-12-14 编辑:beck 标签: 我来听写
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时差N小时:为什么马的腿很细?(下)
Then that foot stops and the other one accelerates. And so on. Thinner, lighter things are easier to accelerate than heavy, massive ones. So if you want speed, put the muscles up high and the skinny2011-12-13 编辑:beck 标签: 我来听写
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时差N小时:为什么马的腿很细?(上)
Why horses have skinny legs? What’s the use of a skinny leg? The answer is Running. The skinniest lower legs belong to the fastest runners. Think of how a deer can move, as opposed to a tortois2011-12-12 编辑:beck 标签: 我来听写
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时差N小时:有钱就一定幸福吗?
Does money make us happy? Well, according to that famous Beatles song, no: Money Can’t Buy Me Love. But, of course, the Beatles also had a hit with their cover of the Motown song Money, That&rs2011-12-09 编辑:beck 标签: 我来听写
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时差N小时:箱子底部的玉米薄片为什么不会被压碎(下)
The friction between the flakes is the same force that causes sand to form a pile rather than spread out like a puddle. In fact, this same principle applies to all granular materials. If you cut the2011-12-08 编辑:beck 标签: 我来听写
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时差N小时:箱子底部的玉米薄片为什么不会被压碎(上)
Why don’t the cornflakes at the bottom of the box get crushed by the weight of the flakes on top? That’s the question on this Moment of Science. Research by mathematician Bruce Pitman of2011-12-07 编辑:beck 标签: 我来听写
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时差N小时:走路时为什么要甩胳膊?(下)
But although it happens passively, arm swinging plays an important role in making your stride more efficient. It does this by counterbalancing your torso and hips and keeping them from twisting and b2011-12-05 编辑:beck 标签: 我来听写
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时差N小时:走路时为什么要甩胳膊?(上)
你想过为什么走路时我们要甩胳膊吗?这是很有趣的现象,因为胳膊在走路时并没有明显的作用。2011-12-02 编辑:beck 标签: 我来听写
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时差N小时:蓝鲸是天生的歌唱家(下)
Wow! That is nearly ten times greater than the difference observed in the whales. Pretty amazing, right? But, why are they such pitch perfectionists? Well, one hypothesis has to do with the Doppler s2011-12-01 编辑:beck 标签: 我来听写
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时差N小时:蓝鲸是天生的歌唱家(上)
Did you know that blue whales sing their songs exactly on pitch, with unbelievable accuracy? Scientists at San Francisco State University analyzed over 4,000 blue whale songs off the coast of Califor2011-11-30 编辑:beck 标签: 我来听写
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时差N小时:外婆担心外孙被宠坏(下)
Dear Grandma:[qh]祖母你好:[qh]Your daughter's parenting skills could use some improvement, and yes, it's possible those kids will grow up to be overweight, undereducated crooks, but she need2011-11-29 编辑:beck 标签: 我来听写
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