ISBN: 978-0-7432-9258-0 A few years ago, we wrote YOU: The Owner’s Manual, which taught people about the inner workings of their bodies—and how to keep them running strong. But you know what? There’s a big difference between an adult’s body and your body, between adults’ health mysteries and your health mysteries, between their questions and your questions. So, teens, this book is for YOU. We’ll talk to you about the biological changes that are happening in y....