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@Rasterman There is a correlation between the geographic distribution of UV radiation (UVR) and the distribution of skin pigmentation around the world. Areas that have higher amounts of UVR have darker-skinned populations, generally located nearer the equator. Areas that are further away from the equator and generally closer to the poles have a lower concentration of UVR and contain lighter-skinned populations. This is the result of human evolution which contributed to variable melanin content in the skin to adapt to certain environments.
Or, as I always thought that the skin of some races is actually transparent therefore you can see how much shit they are full of. Could it be that whites were smart enough to lay under a tree out of the sun millions of years ago while the shit skins were still chasing ancestors of goats to fuck in the noon sun?