At age five, Deborah Heiligman checked out her first library book-- What Is a Butterfly --and her love of science and nature has grown ever since. She has written one other Let's-Read-and-Find-Out Science book, On the Move , illustrated by Lizzy Rockwell. She is also the author of the middle grade biography Charles and Emma , which was a National Book Award finalist and a Michael L. Printz Honor Book. Ms. Heiligman lives in New York City with her husband and two sons.