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

Discussing the book "An Anthropologist on Mars: Seven Paradoxical Tales" (published by Knopf) with the author, neurologist Dr. Oliver Sacks.

Margaret Mead discusses different cultures, anthropology, and society. Margaret Mead discusses topics such as immigrants, American society, poverty, and population explosion.

Discussing his book and upcoming television series "Life on Earth," with the writer and narrator, David Attenborough.

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 "The legacy of Malthus" with the author Allen Chase.