It is pretty fascinating, actually.
Europeans, and those descended from them, have developed paler skin. Here I always thought that it had everything to do with the colder weather. Apparently, however, it is a bit more complicated than that!
This article reveals that, as well as how we developed our lactose tolerance:
Ancient DNA reveals how Europeans developed light skin and lactose tolerance by DANIEL ZADIK, THE CONVERSATION, 15 JUN 2015
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