An intellectual gap separates the Islamic world and the West. Muslim children underperform on most all educational measures, and the societies as a whole produce fewer books, scientific advances, and cultural achievements. Evolutionary psychologist Edward Dutton demonstrates that this is not just a matter of genetics, war, or politics. It comes from Islam itself. Holding to Islamic belief forces people to avoid analytical and creative ways of thinking. Veiling, female circumcision, the Ramadan fast, polygamy, and even praying regularly does the same, leading to worse education systems, increased poverty, and less intellectual development. That said, Islam has clear advantages. The Muslim practices that reduce cognitive ability also elevate ethnocentrism-in-group co-operation. And it is the more ethnocentric groups that win in the intense struggle of Darwinian selection. Thus, Dutton predicts that Islam will come to triumph over the West precisely because it reduces intelligence. This