In his expansive new book, "Psych: The Story of the Human Mind," Paul Bloom, a professor of psychology at the University of Toronto, lays out, in his words, "basically everything I know about the mind." And when he says everything, he means it. Where does consciousness come from? Does IQ matter? What makes us happy? Was Sigmund Freud a madman? The answers to these questions (and more) are all in Paul's book — and in this episode. • To listen to an extended version of Rufus and Paul's conversation, download The Next Big Idea app. • Our newsletter comes out every Thursday and offers a behind-the-scenes look at how we make the show. Sign up today!