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I've had this thought for a long time and finally decided to ask if anybody else has thought the same. There are a lot of places on Earth where snow lies and doesn't melt under bright sun, because it has a very high refractive index. But, if it were greyer, it would melt and cease to exist. It occured to me that it is a lucky coincidence that for snow to exist, it must be white. Or is it not a coincidence, and snow couldn't be not white? Are my concerns valid or am I falling victim to some logical paradox?

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