Tricky bit. It would be cool if you could compress both brains and make both 1/2 the size of a regular brain and combine them to form 2 brains taking up 1 brains worth of space.... but that isn't going to happen so i would have it.....hmm in my skull. Big old lump in my skull, but if you're smart enough, you can become famous for having two brains and being a genius.