Behave: The Biology of Humans at Our Best and Worst
by Robert Sapolsky
Sapolsky's central structuring move — beginning at the moment of a behaviour and working backward through biology, hormones, development, culture, and evolution — is genuinely well-chosen. It prevents the reader from settling into any single explanatory frame for more than a chapter before the ground shifts. The writing is dense but rarely dry; Sapolsky has a researcher's instinct for the counterintuitive result and a teacher's habit of returning to concrete examples. The book is at its best in its middle sections on hormones and development, where the science is clearest and the implications most surprising. The final chapters, where Sapolsky turns determinist philosopher, are more uneven — the argument against free will and for criminal justice reform is earnest but becomes repetitive. At nearly 800 pages, this is a serious time commitment, and some chapters will test non-specialist patience. Readers who follow it through will find their assumptions about human nature durably altered.
