human brains evolving, but why?

This post is dedicated to those who think too much.

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Study finds humans still evolving, and quickly — latimes.com

“In the last 5,000 to 10,000 years, as agriculture was able to support increasingly large societies, the rate of evolutionary change rose to more than 100 times historical levels, the study concluded.

Among the fastest-evolving genes were those related to brain development, but the researchers aren’t sure what made them so desirable, Hawks said.”