A guide to earning money as a babysitter, with advice on getting customers, safety, and handling emergencies.

Surveys the invention, development, and different uses of rockets, from their beginnings in ancient Greece and China to modern efforts to explore outer space.

Describes the nature, causes, and treatment of this common type of mental illness.

Experiments and activities reinforce a general discussion of the properties of light, the electromagnetic spectrum, and color vision, that also outlines the fifteen ways in which electron interactions result in color.

Explores the properties of sound through experiments and activities.

Discusses the causes of epilepsy, how it is diagnosed and treated, and what to do if someone is having a seizure.

Relates the causes, events, and aftermath of the witchcraft trials which took place in Salem, Massachusetts, in the early 1690's and resulted in the deaths of more than nineteen people.

Explores the various cells in the human body and describes how each is best suited to carry out its particular function.

Discusses different types of allergies, causes of allergic reactions, and treatments.

Discusses how common household items can become useful inventions, how many inventions were discovered accidentally, and how new products can be patented. A review of the inventive process; a discussion of the inventions of da Vinci, Edison, and Buckminster Fuller; plus sets of situations that challenge one's powers of invention.