Dunn, Andrew

Describes how simple machines utilize the principle of the slope or incline to plow fields, unlock doors, and lift heavy loads.

Explains how heat works and the functions it serves in our world, discussing such areas as conduction, expansion, and evaporation.

Explores the methods and materials used in building bridges, as well as the environmental impact of bridge building. Includes some projects.

Discusses how the earliest discoveries of humans and flights of imagination brought about the most technologically advanced inventions of the twentieth-century.

Explains how air and water pressure work and how they are used in machines.

Discusses the function and design of tunnels, their impact on the environment, benefits, drawbacks, and future.

Discusses fog, mist, and smog and the conditions which create them.

Text and accompanying photographs discuss the design and construction of various kinds of dams, the benefits gained from them, and some of the negative consequences of damming. Includes several related projects.

Text and accompanying photographs discuss the aesthetic and practical values of skyscrapers and the technology used to build them.