是什么机制控制了用右手或左手的习惯并使左撇子很少出现？
What mechanisms control handedness and keep left-handedness rare?
每年约有2 000位习惯使用左手的人士因不当地使用仅为使用右手的人士设计的设备而死亡。
Around 2, 000 left-handed people die annually due to improper use of equipment designed only for right handed people.
不同文化导致不同的上网习惯，在欧美，网民身体前倾，右手执鼠，左手敲键，很忙活， 而中国的网民则身体靠在椅背上，右手移动鼠标，另一只手闲着。
In the U.S. and Europe, web surfers are leaning forward, one hand on the mouse and the other on the keyboard, typing and mousing equally. In China, however, the process is much different.
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