[janus]

This story reminded me of the guy that had a magnet implanted in his pinky finger, who was then able to sense electromagnetic fields and other stuff

http://gizmodo.com/5895555/i-have-a-magnet-implant-in-my-fin...

[gohrt]

Implant seems extreme. One could do well with, say, compass armbad with a strong magnet and a pokey attacmhent.