The Stuff of Thought: Language As a Window Into Human Nature is a 2007 book by experimental psychologist Steven Pinker. In this—his fifth book on the topics of language and cognitive science written for a general audience—Pinker "analyzes how our words relate to thoughts and to the world around us and reveals what this tells us about ourselves". Put another way, Pinker "probes the mystery of human nature by examining how we use words". The book became a New York Times best seller.