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briandmyers  ·  4490 days ago  ·  link  ·    ·  parent  ·  post: Cyborg America: inside the strange new world of basement body hackers

I believe the movement of your own body is enough - the magnetic field itself need not be oscillating, to be detected (although an oscillating magnetic field would induce a lot more motion in the magnet). But I'm just speculating, have not tried anything yet.