Students’ fascination with moving objects—as well as with how they themselves move—can inspire numerous physical science investigations. This month's Teaching Through Trade Books column focuses on two books about motion: Go, Go, Go! Kids on the Move and Why Doesn’t the Earth Fall Up? And Other Not Such Dumb Questions About Motion. Activities for grades K-3 and 4-6 help children explore how balance influences their own movement and design their own investigations to explain various phenomena.