Stephen Hawking had ALS. What is it? A look at the motor neuron disease

Stephen Hawking has died at the age of 76, according to his family. Here is a look back on his life as one of the world's foremost theoretical physicists. British physician Stephen Hawking announces winners of the Stephen Hawking medals during an event held in Guia de Isora's Island, Tenerife, Canary Islands, Spain. For decades, legendary scientist Stephen Hawking was confined to a wheelchair by a form of amyotrophic lateral sclerosis, or Lou Gehrig's Disease, a neurological disease that impacts movement. He communicated via a speech synthesizer.