The latest Silicon Valley fashion is for tech investors to fund fertility start-ups such as Orchid Health, which proclaims, “Sex is for fun, and embryo screening is for babies.” The latest billionaire status symbol is a quiver full of children: Elon Musk has more than a dozen and Peter Thiel, a late starter, reportedly has four. The plot of a new science-fiction series, “Alien: Earth,” features trillionaires who compete to produce the best super-humans.

Most people associate eugenics with Hitler’s mad scheme to breed an Aryan super-race and liquidate the Jewish people. Yet his version of eugenics was only an extreme version of a faith that was pervasive in the West from 1880 to 1945.

A popular faith

It was a faith that was as popular in the Anglo-Saxon world as the Teutonic one and as p

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