Full Book Summary of Behave by Robert Sapolsky

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A person throws a punch, shelters a child, pulls a trigger, shares a meal, tortures a prisoner, donates a kidney, votes for a demagogue, forgives an enemy. What on earth is going on? That is the huge, unruly, fascinating question at the heart of Behave. Robert Sapolsky takes one tiny slice of time, the instant when a behavior happens, and then refuses to let us stop there. Instead, he keeps asking what happened one second before that, and one minute before, and one hour before, and one year before, and during childhood, and before birth, and even across evolutionary history. By the time he is done, a human act no longer looks like the product of a single cause, or a simple choice, or a tidy moral category. It looks like a knot of biology, experience, culture, history, and circumstance. The book is about the science of human behavior, but it never feels like a dry tour through brain parts and hormones. It is really a long argument against simple stories. We love simple stories. We want the violent person to be just evil, the saintly person to be just good, the political enemy to be just irrational, the stranger to be just other. But behavior is messier than that. The brain is always in conversation with the body. Hormones do not command us like puppeteers. Genes matter, but never by themselves. Childhood shapes us, but does not trap us in a cage. Culture rewires what we fear, love, and punish. Evolution built our capacities for both tribal hatred and breathtaking compassion. What makes the journey so gripping is the voice guiding it. It is witty, skeptical, impatient with nonsense, and deeply humane. The jokes arrive right next to the blood sugar charts. The baboons show up next to the...