As the famous primatologist and neuroscientist Robert Sapolsky says, if you want to understand human behavior and the nature of a good or bad action, you have to understand literally everything - both what happened a second before and what happened millions years ago. In the book, the author examines step by step - one might say, chronologically - 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 island “hate”? Why do London taxi drivers have enlarged hippocampi? How are the lengths of the index and ring fingers related to the amount of intrauterine testosterone? How do adolescents differ from children and adults from a neurobiological point of view? Are there “pure” altruists? What is the difference between forgiveness and reconciliation? Does free will exist? How do complex social networks influence our behavior and decision making? And this is only a small part of the issues considered in the large-scale work of the famous scientist.