47 
Sure, you know why the sky is blue. You’re a learned man and/or woman of learning; you know your way around Wikipedia. But hey, sorry buddy. That’s still amateur hour. The question you should have been asking all along: 18Why isn’t the sky violet?
Actually, on second thought, pretty sure Wikipedia’s going to have an answer for that too. [xkcd]
Because violet is gay.
Just sayin
she told me it was just a pyjama party that got out of hand
So the gay sky isn’t violet because violet is a bit gay?
Pet peeve: People posting xkcd comics without the alt text.
Also, why not do 5min of Googling and explain why it’s not Violet instead of Blue?
http://www.msnbc.msn.com/id/8631798/ns/technology_and_science-science/
Its a mix of both? but our eyes are (relatively) pretty shitty. Gotta love xkcd