Hellman, Hal

Describes how levers and pulleys make lifting and moving things easier.

Discusses world population trends, the rapidly intensifying problems of over-population, and proposed solutions to these problems.

Examines how sensors enable machines to respond to temperature, sound, light, and other sensations and how sensors operate in toasters, burglar alarms, auto-focus cameras, and weather monitoring devices.

Profiles feuds between such figures as Gerolamo Cardano and Tartaglia, Pierre de Fermat and Ren? Descartes, Sir Isaac Newton and Gottfried Wilhelm Leibniz, and David Hilbert and L. E. J. Brouwer, discussing their respective arguments, their motivation, and the mathematical legacies of the discoveries over which they fought.

Explores ten of the most famous scientific feuds from the seventeenth century to the twentieth century, including disputes over the missing link in evolution, continental drift, and nature versus nurture.

Discusses the nature of gold and the value of this metal throughout history, as well as some of its uses and its role in the development of the science of chemistry.