Franklyn M. Branley was the originator of the Let's-Read-and-Find-Out Science series and the author of close to 150 popular books about scientific topics for young readers of all ages. He was Astronomer Emeritus and former Chairman of the American Museum of Natural History-Hayden Planetarium. Molly Coxe has written and illustrated Louella and the Yellow Balloon and and Ducks, Ducks, Ducks, and has illustrated Whose Footprints? and The Big Dipper. She lives in Norwalk, Iowa.