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Discusses current accomplishments in the field of replacing parts in the human body, including organ transplants, artificial organs and implants, and artificial joints and limbs.

Traces the history of scientific research on the workings of the brain from the eighteenth century to the present and discusses sleep, hypnosis, memory, and biofeedback

Traces the history of pharmacology, from the early days of leeches and simple plants to modern research into drugs to work against cancer.

Describes the characteristics and nature of bacteria, looks at the diseases they can cause, and discusses beneficial bacteria used in genetic engineering, food making, and toxic cleanup

Discusses genetic engineering, particularly the history and techniques of cloning, and includes material on recombinant DNA research and test-tube babies.

Explains the nature of viruses, describes how they cause diseases, and looks at virus research

Examines the factors causing changes in the earth's climate, including ocean currents, the destruction of the rain forests, and the greenhouse effect, and discusses predictions for the future.

Describes the nature of parasitism, looks at the parasitic relationships of plants and animals, and discusses hookworms, tapeworms, galls, molds, and leeches

Examines the nature, origins, and dangers of avalanches and discusses preventive and safety measures to be used against them.