Ever wonder who you're really talking to when you argue with yourself? Turns out, it may be your "other half." By studying patients who, for one reason or another, have had the hemispheres of their brain disconnected, scientists have determined that the two halves of our brain represent discrete, conscious, and potentially independent entities. This is all fine when everything is wired up properly, but when the wiring goes wrong the results can lead to "Alien Hand Syndrome."

Just when you thought consciousness couldn't get any weirder...