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Back in 2005, the first edition of 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. 19, and then went on to the University of Pennsylvania, where he earned both a PhD in psychology, and an MD. He completed a 3-year residency in family practice in Lancaster, Pennsylvania. Sax has spoken on issues of child and adolescent development not only in the United States but also in Australia, Bermuda, Canada, England, Germany, Italy, Mexico, New Zealand, Scotland, Spain, and Switzerland.