inventions

Presents 172 entries that examine the lives and work of inventors in the field of communications, transportation, entertainment, medicine, home economics, and agriculture, with biographies and articles about environmental concerns, the patent process, the role of youth, and more.

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

Presents information on various tools and inventions used by early humans, throughout prehistory and history, including stone spearheads, the wheel, a ramp, a plow, axes,levers, log rafts, papyrus, and picture writing. Includes activities for children to help explain basic concepts.

Discusses questions such as why astronomers developed the astrolabe, how military signals led to the invention of the kite, and how abacus made arithmetic easy. Includes directions for constructing these inventions.

Tells the story behind 20 scientific breakthroughs that came about by accident.

Chronicles the life of inventor Nikola Tesla, describes his numerous inventions, and discusses how they were used.

Tells the personal stories of thirty-five American scientists, technologists, and researchers whose inventions have had a significant impact on life in the twentieth century in the areas of medicine and healthcare, consumer products, transportation, energy and the environment, and computing and telecommunications.

A history of the inventiveness of applied science, from the stone tools hewn by the earliest prehistoric people to the dawn of the modern era in 1492.

Easter Bunny is too sick to dye all the Easter eggs in time, so he creates a machine to help.