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.

Edwin T. Buehrer, a Unitarian minister, discusses Unitarianism, his book "Changing Climate of Religion", and human problems. They also discuss humanity, religion, life on other planets, science, and the universe. Includes a clip of Arthur C. Clarke speaking about the universe and life on other planets. Includes a clip of a boy talking about who he thinks God is. Includes a clip of a boy talking about the fall of Rome.

A sprawling conversation with R. Buckminster Fuller including his great aunt Margaret Fuller, future communication, the nature of work, human nature, and physics.