Step-by-step instructions to building over 30 fascinating devices are included in this book for workbench warriors and grown-up inventors. Detailed illustrations and diagrams explain how to construct a simple radio with a soldering iron, a few basic circuits, and three shiny pennies. Instructions are included for a rotary steam engine that requires a candle, a soda can, a length of copper tubing, and just 15 minutes. To use optics to roast a hot dog, no electricity or stove is required, just a flexible plastic mirror, a wooden box, a little algebra, and a sunny day. Also included are experiments most science teachers probably never demonstrated, such as magnets that levitate in mid-air, metals that melt in hot water, a Van de Graaff generator made from a pair of empty cans, and lasers that transmit radio signals. Every experiment is followed by an explanation of the applicable physics or chemistry.