Proof of evolution: hair.
Why do humans have hair? It's completely and utterly pointless if you think about it. But fur on other species of life is worthwhile, needed: warmth etc.
Isn't it likely that this hair is simply a leftover from an earlier form of humanity that has yet to leave? I mean, how would facial/arm etc hair be of any use to a designer etc? Why didn't a designer give humans no hair, or a thicker, fur covering?