resources machines

A color-illustrated overview of how machines work that describes such topics as wheels and axles, pulleys, engines and motors, and wind and water power, and presents step-by-step instructions for related projects.

Discusses various machines and how they work. Includes experiments.

Examines, in text and photographs, the symbolic and material meaning of money, from shekels, shells, and beads to gold, silver, checks, and credit cards. Also discusses how coins and banknotes are made, the value of money during wartime, and how to collect coins.