As the famous primatologist and neurobiologist Robert Sapolsky says, if you want to understand human behavior and the nature of good or bad deeds, you need to understand literally everything — both what happened a second before and what happened millions of years ago. In this book, the author examines step-by-step — one could say in a chronological breakdown — and in great detail a huge number of factors influencing our behavior. How does our brain work? What is the amygdala responsible for, and what should we thank the frontal cortex for? What does the insula "hate"? Why do London taxi drivers have an enlarged hippocampus? How are the lengths of the index and ring fingers connected to the amount of prenatal testosterone? From a neurobiological point of view, how do teenagers differ from children and adults? Are there "pure" altruists? What is the difference between forgiveness and reconciliation? Does free will exist? How do complex social connections influence our behavior and decision-making? And this is just a small part of the questions addressed in this comprehensive work by a renowned scientist.