The most we can really conclude is that they don't currently appear to be possible. We have a sample size of 1 with how many universes we've studied. As far we

The most we can really conclude is that they don't currently appear to be possible. We have a sample size of 1 with how many universes we've studied. As far we know, this could be a simulation, or a brief moment in time when the ever-shifting laws of physics look the way they do, or the dream of a supernatural being. By all means, our physics works (now) and its the best we've got so lets bet on it and drive our society that way, but to suggest some things will never be possible not only creates 0 value for society (perhaps even negative value), but is also the stance proven wrong so many times needlessly. The truth is, we really just don't know and can only make our best guesses.