Conservation of force, energy, matter and all other practical considerations necessary to provide practical technical solutions to practical problems. No. What we really need is a way to slice off all the people who aren’t really good enough to be One of Us. Certainly, if we could just be a head in a jar, the world would be perfect, without the messy business of a body of humanity with which to be bothered. Lucid dreaming is the only solution. Forget the masses and live in your mind. It’s best for everybody.