We are ceaselessly bombarded by messages about sex and gender, facing deeply ingrained beliefs that sex determines our skills and preferences, from toys and colors to career choice and salaries. But what does this constant gendering mean for our thoughts, decisions and behavior? And what does it mean for our brains? Drawing on her work in cognitive neuroimaging, Gina Rippon unpacks the stereotypes and shows how these messages mold our ideas of ourselves and even shape our brains. Urging us to move beyond a binary view of the brain, Rippon suggests we see instead this complex organ as highly individualized, profoundly adaptable and full of unbounded potential.