Biologist, natural historian, and author David Attenborough discusses his book and upcoming television series “Life on Earth.” The book, show, and this interview focus on discussing the evolution of life.

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.

Interviewing Timothy Leary.

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.

Discussing "A Natural History of the Senses" with the author Diane Ackerman.