A review by yoriv
Behave: The Biology of Humans at Our Best and Worst by Robert M. Sapolsky

5.0

One of the best books I've ever read. It goes into detail why we act the way we do. Starting from what influences your actions seconds to minutes before, what your puberty has to do with it, to how much your mothers behavior mattered when you were still a fetus.
It goes deeper into what hormones (testosterone/estrogen) can influence aggression and all the misconceptions about them.
It talks about Us Vs. Them, how we're more eager to help/cooperate with someone that we classify as an "Us".