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Originally Posted by johndallman
Not usefully. The categories are something like "thoroughly implausible" and "extremely implausible."
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Still there *are* degrees. An obvious first cut is does it require more energy than a human metabolism (more than about 100 W)? Those are clearly more impossible than something that you could theoretically have the energy for, and eliminates much of the flashy stuff.
Probably the most plausible psi powers are the limited "ESP" kind - the ones that you could make a case are processing of information your senses could be gathering but humans just don't interpret - Empathy (smell based), or Dark Vision based on echolocation, or Clairaudience (only when you can directly see the noise source), followed by the ones that let you do things to your own body that it does normally do, but faster or better or longer - things like reacting faster (Combat Reflexes), stopping bleeding, purging poisons or diseases, surviving a hour in freezing water, not breathing for minutes at a time, or doubling your ST for a single action.