Joan Cook discusses her book "In Defense of Homo Sapiens" and talks about research done by other scientists working with Chimps and other primates. She explains her stance that not all humans lean towards violence and that nature, not nurture, and the environment creates aggression and violence. The conversation compares economics and Darwinism for a view of humanistic economics.

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.