A revised and updated edition (with more than 70% new material) of the evergreen classic about the innate differences between boys and girls and how best to parent and teach girls and boys successfully, with completely new chapters on sexual orientation and on transgender and intersex kids. Eleven years ago, Why Gender Matters broke ground in illuminating the differences between boys and girls--how they perceive the world differently, how they learn differently, how they process emotions and take risks differently. Dr. Sax argued that in failing to recognize these hardwired differences between boys and girls, we ended up reinforcing damaging stereotypes, medicalizing normal behavior (see: the rising rates of ADHD diagnosis), and failing to support kids to reach their full potential. In the intervening decade, the world has changed drastically, with an avalanche of new research which supports, deepens, and expands Dr. Sax's work. This revised and updated edition includes new findings about how boys and girls interact differently with social media and video games; a completely new discussion of research on gender non-conforming, LGB, and transgender kids, new findings about how girls and boys see differently, hear differently, and even smell differently; and new material about the medicalization of bad behavior.