technology

Photographs and text explore such inventions as the wheel, gears, levers, clocks, telephones, and rocket engines.

Describes the invention and function of such things as a combine harvester, a laser, an electronic microscope, a missile, and plastic. Includes several related activities.

Text and numerous detailed illustrations introduce and explain the scientific principles and workings of hundreds of machines including a lawn sprinkler, pneumatic drill, electric guitar, and a smoke detector.

Chronicles thousands of inventions, and explains and places them in their historical, cultural, and scientific context.

Photographs and text explore such inventions as the wheel, gears, levers, clocks, telephones, and rocket engines.