One of the best things about a rainy day is the possibility of seeing a rainbow, but there's more to rainbows than meets the eye! Simple text introduces readers to the science behind rainbows, including why rainbows occur and what they are made of.

Martha E. H. Rustad is the author of more than three hundred nonfiction children's books, on topics ranging from baby ducks to black holes to ancient Babylon. She lives with her family in Brainerd, Minnesota.