This is second on my all time list behind Kahneman. This thing is huge, it's as close to a comprehensive multi-field discussion of human behavior I've seen, and it manages to stay coherent, well structured, and compelling throughout.

This book goes from the basic structure and biology of neurons, the brain, neurotransmitters and hormones, genetic elements of behavior, epigenetics, development of the brain and behavior from early in pregnancy through adolescence and how negative events (malnutrition, abuse, neglect) alter that development, a pretty damn in depth discussion of evolution and the various selection processes in play from survival of the individual to close family to the species as a whole, and how social structures and culture influence behavior just to lay the groundwork for how much goes into any single decision.

The second part starts to look into behavior closer to directly through the lens of research by psychology. It starts with in-group bias, with solid coverage of how researchers have manipulated whether people feel someone is an us or a them. Next is peer pressure. Excellent coverage of Milgram's electric shock work and the Stanford Prison Experiment. Really there's a lot here and touching on every subject in depth. What I will say is that the psychology, which is the material I'm most familiar with, is presented masterfully, engaging, does a good job of being clear on what the research does and doesn't say, and consistently refers back to the groundwork in the first part of the book.

There is a third part where he discusses what we should take away from all of this, and he loses me a bit at points in the discussion of the justice system. I'm not entirely sure what he's trying to say. But he comes back strong with discussions of how to work past large scale conflict including war and even genocide, then the overall message that we can use our understanding of context to frame things in ways that allow us to be better to the people around us and drive positive change. Overall with some very minor hiccups, he manages to keep a consistent thread throughout this absolutely insanely broad work. He doesn't just skim through topics. There's a solid level of depth throughout. The organization is excellent. To the best of my ability to determine, it's one of the best sourced books I've read. He does all this while keeping a light, not too serious tone and throwing in mild wit and wordplay in a way that adds to the level of engagement.


If that's not enough, the appendices are great too.