" Today, the witch theory of causality has fallen into disuse, with the exception of a few isolated pockets in Papua New Guinea, India, Nepal, Saudi Arabia, Nigeria, Ghana, Gambia, Tanzania, Kenya, or Sierra Leone, where “witches” are still burned to death. A 2002 World Health Organization study, for example, reported that every year more than 500 elderly women in Tanzania alone are killed for being “witches.” In Nigeria, children by the thousands are being rounded up and torched as “witches,” and in response the Nigerian government arrested a self-styled bishop named Okon Williams, who it accused of killing 110 such children. "

― Michael Shermer , The Moral Arc: How Science and Reason Lead Humanity toward Truth, Justice, and Freedom