It's a pet peeve of mine to be misquoted or misinterpreted. I have not said that five is best. Nor that having five fingers has been THE trait that meant survival of even a single species (I don't believe I've even said it was A trait that ensured survival). It's remarkable that five fingers is so common. If five fingers was out and out the best then its commonality would be entirely unremarkable. Think on it. Cliff