Quinn Norton, a San Francisco journalist, had a tiny magnet implanted in her finger, which enabled her to detect electrical fields.
Bits of my laptop became familiar as tingles and buzzes. Every so often I would pass near something and get an unexpected vibration. Live phone pairs on the sides of houses sometimes startled me.
You might think of self-experimentation as a modern version of “know thyself” but this is “know the rest of the world”.