DAVID: He could have, or just the one needed for our upright posture.-dhw: Good. So you agree that it is possible for other organisms to engineer their own mutations. We are making progress!-DAVID: We don't know how far epigenetic changes can/will make new species, since we don't know how new species are created. We've had this discussion before about inventive mechanisms, with no conclusion except there might exist like it.-That is what I call progress. I have fought long and hard for the concession that this hypothesis is possible! Since none of the facts are known, only the faithful can draw clear conclusions.