nobody quite knows what powers are, since they seem to be genetic, but defy every law of science. they can be effected by chemistry and psychology, but nobody can figure out where they come from. 

powers are accepted on a case by case basis. in the old RP (School of Powers), we had powers that ranged from telepathy, technopathy, intangibility, regeneration, energy manipulation, flight, mimicry and a dozen others Jinxer can tell you more about it, he's the one who invented the idea.