In the world of radical identity politics, two groups with very different philosophies have been ignoring science in the name of advancing equality: gender feminists and transgender activists. Gender feminists — who are distinct from traditional equity feminists — refuse to acknowledge the role of evolution in shaping the human brain, and instead promote the idea that sex differences are caused by a socialization process that begins at birth. Gender, according to them, is a construct; we are born as blank slates and it is parents and society at large that produce the differences we see between women and men...