Is it nature or nurture? Yes! In this lecture I offer a different perspective on the nature/nurture debate, using striking and often amusing evidence for the influences of society on our biology. Ranging across the biological sciences — genetics, hormones, and neuroscience — I discuss the newest research on society-biology interactions, paying special attention to the implications for understanding gender differences and similarities. The article closes with an argument that embracing these developments can enhance rather than harm ongoing efforts to reduce social inequalities of all kinds.