A Utah “bio-hacker” recently implanted magnets into his ears to achieve what end?

By wrapping a powered copper wire coil around his body, magnets implanted into the cartilage of each ear can pick up a low-frequency magnetic field, causing the magnets to vibrate like speakers. The man reportedly got the idea after hearing about “invisible headphones” that used magnets. Some have suggested the invention could be used as a hidden communication device for spies or for those who would like to cheat at poker.