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

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

Discussing the book "Shadows of Forgotten Ancestors: A Search for Who We Are" about the evolution and the future of the human species. Includes an excerpt of the astronomer Harlow Shapley speaking at the beginning. Includes Carl Sagan reading an excerpt from the book at the end.

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 "Margaret Mead and Samoa the making and unmaking of an anthropological myth" with the author Derek Freeman.

Studs interviews Dr. Timothy Leary about the three stages of the psychadelic experience: turning on, tuning in, and dropout. Leary discusses how his life changed from being a successful psychologist and professor at Harvard to renewing his life as a religious teacher. He shares how the drug LSD is used in the tribal communities who turn on and also explains the values of those who practice turning on. Leary also describes other methods used to turn on, which he considers a religious experience. Studs reads what Richard Goldstein said about Dr. Leary.

Studs talks with Donald Johanson about his book "Lucy: The Beginnings of Humankind," in which the famed paleoanthropologist describes his discovery of the female hominin fossil in Ethiopia. The conversation includes talk of Charles Darwin, Eugène Dubois' Java Man discovery, what makes a hominid, holes in the fossil record, fossil dating, his disagreements with Louis and Richard Leakey, site discovery, and his belief that the Hadar Formation in the Afar Triangle of Ethiopia holds the keys to the evolutionary puzzle. Includes snippets of the Beatles' "Lucy in the Sky with Diamonds."

Interviewing Timothy Leary.

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

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

Discussing "The Difference of Man and the Difference it Makes" and the philosophical ideals of Mortimer J. Adler. Mr. Adler speaks of his idea that the difference between human and animal behavior is a radical difference in kind.