xkcd
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中文频道
XKCD中文站,一个关于浪漫、隐喻、数字、以及语言的线上漫画。
Rayleigh Scattering
If you ask "why are leaves green?" the usual answer is "because they're full of chlorophyll, and chlorophyll is green," even though "why does chlorophyll scatter green light?" is a great question too.
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