The Selfish Gene was dropped. The book contains no illustrations. The book has been translated into at least 23 languages including Arabic, Thai and Turkish. In 2006, a 30th-anniversary edition was published with the Trivers foreword and a new introduction by the author. It was accompanied by a "festschrift" entitled "" (2006). In March 2006, a special event entitled "The Selfish Gene": Thirty Years On was held at the London School of Economics. In March 2011, Audible Inc published an audiobook edition narrated by Richard Dawkins and Lalla Ward. In 2016, Oxford University Press published a 40th anniversary edition with a new epilogue,
The Evolution of God of God. Among other things, Wright discusses the role of evolutionary biology in the development of religion. Geneticist Dean Hamer hypothesized that some people have a specific gene that makes them prone to religious belief, which he calls the God gene, and that over time natural selection has favored these people because their spirituality leads to optimism. Wright, however, thinks the tendency towards religious belief is not an adaptive trait influenced by natural selection, but rather a spandrel - a trait that happens to be supported by adaptations originally selected for other purposes. Wright states that the human brain approaches