Stephen Hawking's voice was his tool and his trademark

Stephen Hawking's computer-generated voice was known to millions of people around the world, a robotic drawl that somehow enhanced the profound impact of the cosmological secrets he revealed.The technology behind his means of communication was upgraded through the years, offering him the chance to sound less like a machine, but he insisted on sticking to the original voice because it had effectively become his own.Hawking started to communicate again using his eyebrows toindicate letters on a sp