Yiddish author Isaac Bashevis Singer discusses his collection of short stories, "Short Friday," as well as his writing style and spiritual influences.

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 Passion of Ayn Rand" (published by Doubleday) with the author Barbara Branden.