Book excerpt: Time for shadow play! After reading about how light and objects interact to create shadows, young children won’t be able to resist twisting, wiggling, bending, and shaking to see the phenomenon for themselves. To add to the enjoyment, Dark as a Shadow is written in lively rhymes, making it even more fun to learn the science behind why shadows change length through the day and disappear in the dark. Dark as a Shadow is part of the I Wonder Why book series, written to ignite the curiosity of children in grades K–6 while encouraging them to become avid readers. These books explore the marvels of light, color, machines, sound, and other phenomena related to physical science. Included in each volume is a Parent/Teacher Handbook with coordinating activities. The I Wonder Why series is written by an award-winning science educator and published by NSTA Kids, a division of NSTA Press.