Gurian, himself the father of two girls, provides crucial information for fully understanding the basic nature of girls: up-to-date scientific research on female biology, hormones, and brain development and how they shape girls' interests, behavior, and relationships.He also offers insight into a culture mired in competition between traditionalism and feminism and a new vision that provides for the equal status of girls and women yet acknowledges their nature as complex and distinct from men. He explains what is "normal" for girls each year from birth to age 20; what developmental needs girls face in each stage; how to communicate effectively with girls; and how to cope with developmental crises such as early sexuality, eating disorders, parental divorce, and more.