The authors, physicist Greg Cochran and anthropologist Henry Harpending, challenge a common view among both the public and in Academia that evolution ended some 50 thousand years ago after the exodus out of Africa, or that it’s too slow to have any meaningful impact on humans within that time period. For that reason we must, they claim, be the same biological creatures as we were back then.
As a consequence of this view, the cultural diversity that we see today and throughout history must also be unrelated to biology. They quote the late biologist and popular science writer Stephen Jay Gould who sums up (and embraces) this opinion,
“Everything we call culture and civilization we’ve built with the same body and brain.”
Most of his readers gladly accept this as the truth. It is after all the Blank Slate that has dominated Western thought on human nature for the last 400 years or so that claims we are all built of the same stuff, we all share an incredible ability to change, improve, and evolve.
Steven Pinker did some damage to this idea but most people who have read him seem to have landed in a half slatism, admitting they were wrong but only half wrong. In psychology, this is known as anchoring: people don’t change opinion to fit the evidence but meet the evidence half way. And ironically you can be as anchored in thinking you’re a free spirit as in any other point of view.
But “the same body”? Are there Japanese people who can be mistaken for Scandinavians? Are there Peruvians who could pass themselves off as Nigerians?
Keep reading… I especially recommend some of the other books he mentions, as I have noticed that Blank Slatism is still firmly entrenched (briefly, the idea that a young child is a blank slate upon which the parents can write whatever they want).