Richard Dawkins defends theory of evolution

A vociferous defender of Darwin, Richard Dawkins has a new book that lists the evidence that the theory of evolution explains how life on Earth came to be.

Guests

• Richard Dawkins: Acclaimed science writer and author of the new book, "The Greatest Show on Earth: The Evidence for Evolution." His previous books include, "The God Delusion," and, "The Selfish Gene."

Resources

• Richard Dawkins's official website
• Excerpt from Chapter 1 of "The Greatest Show on Earth"