Describes the various animals that live within the soil under our feet, including earthworms, roundworms, snails, mites, beetles, and ants.

Examines the pros and cons of keeping less common dog breeds such as akitas, chihuahuas, and Saint Bernards, discussing their care, feeding, and emotional needs.

Defines the process of aging and discusses society's changing attitudes toward the aged.

Gives a history of the study of leukemia; presents information about its symptoms, causes, diagnosis, treatment, prevention, and social and economic impact; and describes current research and future prospects.

Discusses the scope and history of this growing health problem, its medical and ecological background, symptoms, diagnosis, treatment, practical methods for avoiding infection, and current research into possible cures.

Describes the composition and functions of different types of cells.

Explains the various forms of cancer, their symptoms, possible causes, and treatment, and discusses research being conducted to find better means of preventing, detecting, treating, and curing this disease.

Discusses symptoms of the various types of headaches, including migraine, cluster, and muscle contraction (tension) headaches, and explores what is known of their causes and cures.

Explains the various types of allergies, their symptoms, causes, and treatment, and discusses research being conducted to find cures for allergic diseases.