"As to why is it shrinking, perhaps in big societies, as opposed to hunter-gatherer lifestyles,
we can rely on other people for more things, can specialize our behavior to a greater extent, and maybe not need our brains as much," he added
"Although sickle cell is best known in Africa, there is also an India-Pakistan variant of it that seems to have evolved separately," Hawks explained. "Both variants have evolved very recently, in the last three or four thousand years, and in that time have risen to as much as 10 to 15 percent of the populations. That's pretty rapid change
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