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what is known / the possibility of a quarts/ (other) crystal implant next to a magnet in finger tip? the crystal would need to be able effect/resonate w/ magnet field.
mayhap even a composite crystal sensitive to multiple frequencies ?
I don't know a lot :( but the idea was if you had a crystal the would respond to frequencies too minute to be felt w/ just the magnet you could put them together and the magnet would act like a (amplifier?) so you would be able to sense a greater range
basically the crystal would react then would agitate magnet physically then you would feel it