Physics of the Impossible
From Wikicliki
Class I impossibilities Impossible today but do not violate the known laws of physics Telepathy, psycho kinesis, invisibility Force fields
Class II impossibilities Technologies which sit at the very edge of our understanding of the physical world Hyperspace travel, time machines
Class III impossibilities Technologies which violate the known law of physics There are very few because if they do turn out to be possible they would represent a fundamental shift in our understanding of physics
