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why does my butt itch?
Wolfram|Alpha isn't sure what to do with your input
Though it does know why the sky is blue....
The sky's blue color is a result of the effect of Rayleigh scattering. Shorter-wavelength blue light is more strongly scattered in the earth's atmosphere than longer-wavelength red light; the human eye perceives the color blue when looking at the sky as a result.
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