IdeaMine

yeah, i think "user fist" (great phrase, btw) can be considered biometrics-- like gait analysis, as you say. user skills, like juggling... hm. probably fall into the same category as making two people turn keys on opposite sides of the room at the same time, which probably falls into the same category as having a key with bits that are placed to turn a bolt without being blocked by wards, which is classically considered a "what you know" thing. but it keeps seeming like there's a difference, to me; maybe because for humans, procedural and declarative knowledge are distinct. hm.