From Implanting a magnet in your fingertip adds a sixth sense:
This morning’s Wired News has a fascinating article on the practice of implanting small, strong rare-earth magnets in one’s ring-finger. The result is a kind of “magnet sense” — people who’ve had the implant report that they can tell when a wire is live and when they’re going through a magnet security-scanner at a store, even when their laptops’ hard drives are spinning up.
Take that, Scientology Power Center!