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The #1 bestselling Boy's Body Book includes everything you need to know about growing up, even the embarrassing stuff. The newly updated fifth edition provides advice for parents and addresses questions a pre-teen boy may have while maturing through puberty and becoming a man.

Plenty of experts argue that anyone who wants to develop a skill, play an instrument, or lead their field should start early, focus intensely, and rack up as many hours of deliberate practice as possible. If you dabble or delay, you’ll never catch up to the people who got a head start. But a closer look at research on the world’s top performers, from professional athletes to Nobel laureates, shows that early specialization is the exception, not the rule.

The #1 bestselling Girl’s Body Book includes everything you need to know about growing up, even the embarrassing stuff. The newly updated fifth edition provides advice for parents and addresses questions a pre-teen girl may have while maturing through puberty and starting her period.