i wasn't saying it as if it was a failure, they simply didn't need it in thier enviroment. what i am saying is that i most parts of the world it would be more benificial to have melanin. also we have to realize that human evolution is different from other species. other species are more likely to be affected by such changes, and therefore adapt. with society the way it is now, you won't see large changes like this for a long time.