Books with author Hal Hellman

Presents a detailed, informative look at the impact that gold, one of the most intriguing of all chemical elements, has had on the world--from an object of worship and the inspiration for vast explorations to its role in modern technology.

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

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9780877209447 Complete, up-to-date coverage of a one-year high school biology course that fulfills the scope of the NYS Living Environment Core Curriculum. Suitable for any standard one-year course in biology.

Photographs and sketches illuminate designers' conceptions of future land, air, and sea modes of transportation

Describes a variety of bugs and insects and their harmful effects on the health of man and his pets and livestock.

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

A brief and simple explanation of the physical principles governing energy and inertia.

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