In all our contemporary conflicts over the teaching of evolution in schools, there’s one question that nobody asks: To what does the embrace of Darwinism lead? Historian Richard Weikart explores that topic in a book called From Darwinto Hitler: Evolutionary Ethics, Eugenics, and Racism in Germany. Despite that provocative title, Weikart is no sensationalist. He’s not out to prove that Hitler and the Nazi party were directly inspired by Charles Darwin’s theories. But what Weikart does demonstrate, through exhaustive research, is that Darwin’s ideas about the origin of species helped create a culture that devalued human life. And in that...