The concluding chapter of Dawkins's _Climbing Mount Improbable_ is all about this, and it needed a whole chapter because it's mind-blowingly intricate. http://

The concluding chapter of Dawkins's _Climbing Mount Improbable_ is all about this, and it needed a whole chapter because it's mind-blowingly intricate. http://books.google.com/books?id=erRC0ELnZdsC&pg=PA300&dq=climbing+mount+improbable+a+garden+inclosed http://books.google.com/books?id=erRC0ELnZdsC&pg=PA300&#...