When men start a new project, it starts with a plan. The plan has to be carried out, worked through, details arranged for, and you don't have any trouble until the thing you did not expect, turns up. The sole purpose of any of these devices - any machine - is to serve human beings. the machine goes first to try things out, but the sole purpose of doing it, is so that men can follow, and women too - but there are problems of human nature that sometimes complicate the most scientific of plans...