Encouraging…Disabled scientist Professor Stephen Hawking is using a hi-tech gadget to communicate by blinking because his deteriorating health limits movement. The Infrared Sound Touch (IST) switch has been developed by the American company Words+ and works by emitting a very low-powered infrared beam. The reflection of the beam changes when the eye is closed and the cheek muscle moves and so controlling the computer is as simple as blinking. Link.
Hawking talking with his blinks