Discusses the discovery of atoms and how they work, nuclear energy and weapons, nuclear radiation and its medical uses, atomic clocks, and other applications.

Describes different kinds of microorganisms, including bacteria, fungi, and algae, and both their harmful and beneficial effects, as well as efforts to prevent the harm that some germs cause.

An introduction to the history, types, and reading of maps.

Examines monsoons and the effects that they have.