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

Dr. Alan Solem, a malacologist, and Dr. John Engle, a bryologist, from the Field Museum discuss a research trip they plan to take to Australia. The two doctors also discuss climate and ecology in the Americas and in Australia. Dr. Solem will be researching land snails and Dr. Engel moss and liverworts.

Dr. Eugene Mindel, child psychologist and author, discusses his book, "They Grow in Silence: The Deaf Child and His Family,". Dr. Mindel and Studs talk about deaf children and how they learn to communicate without the ability to hear or speak. Studs reads an excerpt from the book about a deaf person feeling locked into themselves. Studs and Dr. Mindel talk about the the book "In this sign" by Joanne Greenberg a novel that portrays the isolation and loneliness of the deaf couple and the struggle of their hearing daughter.

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."

Discussing the book "The enchanted loom" with the author Robert Jastrow.

Discussing the book "The enchanted loom" with the author Robert Jastrow, also Studs reading "The hour of letdown" by E. B. White.

The Rocky Mountain Institute is a nonprofit organization working to foster the efficient and restorative use of natural resources.

Discussing and reading from the book "The mismeasure of man" with the author Stephen Jay Gould.