![Allan Gregg in Conversation (Video) show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/036/148/small/allan-gregg-in-conversation-video.jpg)
Summary: His controversial bestseller The God Delusion angered some, inspired others. Evolutionary biologist Richard Dawkins. Now the world's most famous atheist has come out with a new book that sets out to make the open-and-shut case for evolution. It's called The Greatest Show on Earth.