Finished Driven: How Human Nature Shapes Our Choices, a “sociobiological theory of motivation.” It was pretty solid. What drives you to acquire, bond, learn, and defend? Those are the four innate drives within each human and the four main chapters explore each of these drives. It concludes with some less impressive but still decent chapters on putting a business spin on it all, discussing how employees need to fulfill all four of these drives in order to be happy. All in all, this book is a nice mix of science, Darwin, business, and that same old problem of “what makes people do what they do.” If these topics interest you, I’d recommend this book.