Ages 6+.

Zippy art and clear explanations introduce the basic characteristics of four states of matter and how they change from one state to another. Straightforward text presents the facts and Raff's infographic illustrations demonstrate the science and tell a humorous story. There are hands-on activities, such as using a chocolate bar to demonstrate material consistency and using a balloon to prove gases have weight, to reinforce the learning. A glossary defines density, plasma, vapor, and more essential terms.