My recent reading has included A Troublesome Inheritance (2014) by Nicholas Wade. Wade is an experienced science journalist -- he is a graduate of King's College, Cambridge, was deputy editor of Nature , and before going freelance he was both a reporter and an editor at The New York Times, where he wrote frequently about scientific and environmental matters. His book has the subtitle "Genes, Race, and Human History," which suffices to reveal how fraught is the subject matter. The point he wants to make is that biological evolution continues to change the human genome, and does so at time scales which are relevant to an understanding of history, not just dim pre-history. Evolution by natural selection isn't just about the fossil "Lucy" and her peers. It's about the fellow or gal in the mirror this morning. Evolutionary psychologists, he says, commonly "teach that the human mind is adapted to the conditions that prevailed at the end of the...