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The changes as we settled down into villages and then cities wrought havoc on our biology, adapted as it was to millions of years of leading a semi-nomadic existence as hunter-gatherers. Instead of modifying the culture to suit our physiology, though, we seem to have adapted biologically to the prevailing culture. The signals of this are still visible in our DNA, and we are still in the process of adapting to it. It is likely that we have changed more at the DNA level in the past 10,000 years than we did in the previous 100,000. This acceleration in the rate of evolutionary change is unprecedented in the history of our species.
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