Explains in simple terms the reason some objects float.

Reveals the science behind buoyancy and why objects float, even if they are large cruise or military vessels. Features colorful photographs and illustrations.

From the critically acclaimed author of the Edge of Extinction series comes this fast-paced, action-packed, and heartfelt adventure about a group of kids with u

A Kirkus Reviews Best Book of the Year A Chicago Public Library Best of the Best of the Year "Profoundly moving . . . Will take your breath away." —Kathleen G

Read Along or Enhanced eBook: Vibrant photographs and accessible text introduce young scientists to the concept of density. Readers are encouraged to explore wh