 The UK edition includes an introduction by Stephen Fry, and the US edition, instead, by Christopher Cerf.The audiobook edition consists of 7 CDs, mostly read by Simon Jones, but also includes both of the introductions, read by their respective authors, as well as the tributes written and read by Richard Dawkins.US paperback editions have yet another introduction, written by Terry Jones, and omit some material due to issues with copyright.