Steven Pinker is a cognitive psychologist, linguist, and popular science author. He is Johnstone Family Professor in the Department of Psychology at Harvard University, and is known for his advocacy of evolutionary psychology and the computational theory of mind. His new book "Enlightenment Now: The Case for Reason, Science, Humanism, and Progress" will be released in February 2018. Learn more about your ad choices. Visit podcastchoices.com/adchoices