Marvin Minsky once said that the human mind operates at only one tenth of its full capacity because the rest is taken up by the operating system's overhead. I always thought that was kind of a funny statement. When you get right down to it, nobody's really sure how the brain functions, or even how the mind operates inside of the 2.8 pounds of matter behind your eyes. People have variously been stabbed in the head (ye gods), lost a full quarter of brain mass in accidents, and even had entire hemispheres surgically excised and gone on to live …