Here's Quinn Norton's talk at 23C3 (five years ago) about functional body modification, including her personal experience & some of the problems with embedded magnets: warning it's a little graphic https://www.youtube.com/watch?v=voA7Uz7uABE There's a text-and-picture summary here if you don't want to watch the video, also with graphic photos: http://www.we-make-money-not-art.com/archives/2007/01/quinn-...