Scientist and atheist Richard Dawkins had a worldwide bestseller a couple of years ago with his book "The God Delusion". Now he is back with a new book, "The Greatest Show on Earth", which insists that Evolution is an unarguable certainty to explain life on Earth. Plus, Colonel Richard Kemp is the former commander of the British forces in Afghanistan. He has written a book called "Attack State Red" and joins the show to discuss the military campaign in Afghanistan.