(3) 4-6 Simple Machine Projects series. Each book alternates definitions of simple machines and their effects on force, work, and energy with step-by-step activities in which readers are directed to build and test examples of the machines. Helpful photographs illustrate the activities and provide everyday examples, while guiding questions help students focus on the physics. Facts about historical and modern applications are appended. Reading list. Glos., ind. Review covers the following Simple Machine Projects titles: Making Machines with Pulleys, Making Machines with Ramps and Wedges, and Making Machines with Springs.

Reviewer: Danielle J. Ford

(3) K-3 Simple Machines series. Machines couldn't be any simpler in this newly revised series that introduces six basic tools for making work easier. Clear, brief text accompanies pictures of everyday objects showing force applied, motion achieved, and effort reduced. The concepts behind levers are easiest to understand, while gears and pulleys are more challenging. Easy activities invite experimentation so kids can see for themselves how things work. Glos., ind. Review covers these Simple Machines titles: Levers, Pulleys and Gears, Ramps and Wedges, Screws, Springs, and Wheels and Cranks.

Reviewer: Paula M. Cairo

(4) 4-6 Machines in Action series. These books introduce simple mechanisms, explain their basic scientific principles, and show how they are used in almost every aspect of civilization, including transportation, architecture, and farming. The simply written texts include instructions for pertinent projects and experiments; questions are scattered throughout each volume. Photos, illustrations, and blocks of text with colored backgrounds contribute to the books' crowded layouts. Bib., glos., ind.

Reviewer: Peter D. Sieruta