With descriptive directions and large, clear photographs, each appealing volume takes readers step-by-step through a simple experiment then explains the science behind it. A few materials may be hard to find, and the target audience will need adult help, but the concrete examples lend themselves well to the concepts of liquid density (Rainbow), gases (Rocket), and molecules (Balloon). Additional content available through the Capstone 4D app. Reading list. Glos., ind.