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       xkcd - A Webcomic - Rayleigh Scattering (1818)
        
       Image:
 (PNG) rayleigh_scattering.png
        
       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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