Genomics is proving to be as important as archeology, linguistics, and written records as a means to understand our ancestry. The human genome provides not only all the information a human embryo needs to develop, assays David Reich, but also the hidden story of our species. Delving into how the genomic revolution is transforming our understanding of humans, Reich explains how DNA studies reveal deep inequalities between the sexes and among individuals. Provocatively, Reich's book suggests that there might very well be biological differences among human populations, but that these differences are unlikely to conform to common stereotypes.