Robert Kurzban is one of the best evolutionary psychologists of his generation: he is distinctive not only for his own successful research and sophisticated understanding of psychology, but also because of his wit—Kurzban is genuinely clever, sly, succinct, and sometimes hilarious.—Steven Pinker, Harvard University"In this amazing book, Robert Kurzban carries out a brilliantly thought-provoking conversation with himself that made me think hard—and laugh out loud. Using clever examples and a revolutionary scientific approach, he shows that contradiction is truly a fundamental human experience. No wonder, then, that I wanted to share this book with my friends—but I also wanted to keep it for myself! If you don't read this book, you'll be left wondering what everyone (else) is talking about."—James H. Fowler, coauthor of Connected: The Surprising Power of Our Social Networks and How They Shape Our Lives"Here is a fun counterpoint to the explosion of examples showing that humans do not act in accordance with the predictions of standard rational models. But Kurzban is no defender of the standard models. Rather he seeks an understanding of why our actions may appear contradictory in particular contexts, but serve us well in others, and why that helps to improve our fitness for decision, if not always for a life of liberty."—Vernon L. Smith, Nobel Laureate in Economics