Since the terrorist attacks of September 11th, 2001, left a smoking crater in lower Manhattan, it’s been common knowledge that religion divides people. After all, the hijackers who steered jetliners into some of the world’s best-known buildings were hardline Islamists, motivated by a grim theological doctrine of holy war against the West. When taken against the backdrop of history, with its endless Crusades and holy wars, these horrific attacks cast religion as the root cause of human violence and strife. But is this hard-and-fast conclusion really true? A just-published paper suggests that, on the contrary, some religious people are actually less prejudiced against outsiders.