Hint: It's not about the sunlight, except...

Hint: It's not about the sunlight, except that it is, but not in the way that you might think.

Essays on the U.S. Color Line » Blog Archive » Why Are Europeans White? (E1)

Most people know that it has something to do with sunlight, UV, latitude, and vitamin D. Here is a map of solar UV at the surface taken from satellite. It matches the skin-tone map everywhere but Euro...