Crash! Boom! a Math Tale

Robie H. Harris is the New York Times best-selling author of It's Perfectly Normal: Changing Bodies, Growing Up, Sex, and Sexual Health; It's So Amazing! A Book About Eggs, Sperm, Birth, Babies, and Families; and It's NOT the Stork! A Book About Girls, Boys, Babies, Bodies, Families, and Friends. She is also the author of the Let's Talk About You and Me series. Robie H. Harris lives in New York City. Chris Chatterton is an author, animator, and the illustrator of There's a Bison Bouncing on the Bed! by Paul Bright and When Santa Came to Stay by Timothy Knapman. Chris Chatterton lives in Newcastle upon Thyme, England.