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As in previous books in this critically acclaimed series, Brynie polled hundreds of high school students across the country to find out what they wanted to know

As in previous books in this critically acclaimed series, Brynie polled hundreds of high school students across the country to find out what they wanted to know

As in previous books in this critically acclaimed series, Brynie polled hundreds of high school students across the country to find out what they wanted to know

How do living things reproduce? How do twins, triplets, and other multiple births happen? How does fertilization occur? Find out in this frank and accessible lo

How much of a person’s body weight is made up of muscle? Can you learn to control your heart rate using your mind? How does taking steroids affect muscles—a