Richard Dawkins gives an introduction to his new book "The Greatest Show on Earth: The Evidence for Evolution." He explains why this book was necessary, and what readers can expect from this highly-anticipated work. The book is available now in the UK, and will be released in the US on September 22nd! Read the first chapter of "The Greatest Show" at http://richarddawkins.net/thegreatestshowonearth Also available as an unabridged audiobook on CD. Richard Dawkins is the bestselling author of "The God Delusion" and "The Selfish Gene." Interview footage by DJF Productions Additional video & music by Josh Timonen