Evolution and the future of the human race are among topics in Carl Sagan's and Ann Druyan's book, "Shadows of Forgotten Ancestors: A Search for Who We Are." Included is an excerpt of the astronomer Harlow Shapley speaking at the beginning. Carl Sagan also reads an excerpt from the book at the end.

Discussing the book "Modern meat: antibiotics, hormones and the pharmaceutical farm" with the author Orville Schell.

Interviewing astronomer David Schramm.

Nuclear physicist, Dr. Leo Seren, discusses atomic fission and nuclear experiments.

Studs Terkel plays a variety of audio clips pertaining to the concepts of life and mankind destroying itself. The audio clips featured are from various established and respected writers, social leaders, and musicians.

Discussing the dangers of nuclear power and the effects of radioactive pollution with biologist Dr. Carl Johnson and biophysicist Dr. Ed Gogol.

Interviewing Dr. Bertram Carnow about environmental health, air pollution, and occupational diseases.

Oceanographer Jacques Cousteau discusses man's effect on the planet. Includes a clip with whale sounds and statements by Joan McIntyre.