Good ideas and conversation. No ads, no tracking. Login or Take a Tour!
I think it has to do with how we recognize people. If I look at you and see your face, I'll recognize it next time I see it and assume that the body bearing that face, and that head is the same and that the entity within that body is the same as the one I interacted with the last time I saw the face. You could get a new internal organ and I would never know, you would appear the same.