In , readers will learn how to build a Kelvin water drop generator out of six recycled cans and alligator clip jumpers, a solar-powered seesaw from a large dial thermometer and a magnifying glass, and a windmill from eight yardsticks, PVC pipe, cardboard, and converter generator. Children will investigate the energy-generating properties of a solar cell, a radiometer, a Nitinol heat engine, and a Peltier cell. They’ll even build a human-powered desk lamp. Each project includes a materials and tools list, as well as online information on where to find specialized components. And for young scientists, author Mike Rigsby demonstrates how to use an infrared thermometer, a digital multimeter, and an electrical usage monitor to test their designs. Armed with this collection of technological possibilities, can the solution to the earth’s energy crisis be far off?