Are boys and girls really that different' Twenty years ago, doctors and researchers didn't think so. However, an avalanche of research has shown that sex differences are more significant than anybody guessed. Gender differences are real, biologically programmed, and important to how children are raised, disciplined, and educated. Dr. Leonard Sax addresses a host of issues, including discipline, learning, risk taking, aggression, sex, and drugs and shows how boys and girls react in predictable ways to different situations. A leading proponent of single-sex education, Dr. Sax points out that parents and teachers would do better to recognize, understand, and make use of the biological differences that make a girl a girl and a boy a boy.