The title of this book, Nonzero, refers to the concept of the “non-zero-sum,” which comes from game theory. Looking at human history–and for that matter the whole history of life on earth–through the lenses of game theory can change your view of life. At least, that is a premise of this book. What exactly is meant by “change your view of life”? That is a question with a book-length answer. But there is enough material on this website to give you the general idea.