I wish I'd read that book by that wheelchair guy (or how Stephen Hawking Communicates)

Stephen Hawking is possibly the greatest physicist of the last century, and arguably one of the most influential ever. His list of achievements is enviable, and what makes them even more astounding is that many of his accomplishments have been achieved whilst he has suffered from a debilitating form of motor neuron disease. Amyotrophic Lateral Sclerosis (ALS) is a progressive and ultimately fatal neuromuscular disease, but despite enduring this difficulty, he has 184 scientific publications, including a best selling book A brief history of time. This week, we are going to look not at this man's scientific achievements, but at some of the cool technologies he uses to communicate.