        There was some way that the scientist in the Asimov story had used the anti-gravity field as a perpetual-motion type of energy generator.  Was that actually possible?  The laws of thermodynamics might not apply when reality itself was being bent.  If that was so—disregarding the first-contact—this single construct might change the course of humanity.  What fuel was their spaceship using that they could afford the energy cost to just keep this running on the beach?