This fame is because of brilliant scientific feats, and because he has achieved these while being almost completely paralyzed over a period of more than 30 years by the progressive (and usually quickly fatal) neuromuscular affliction known as Lou Gehrig disease. Hawking, with one of the most brilliant minds in modern science, is able to communicate only at a rate of a few words per minute using eye blinks and a computer voice synthesizer controlled by small remaining motion in a finger.