Physicist Stephen Hawking has died at the age of 76.
His known works involve black holes and the theory of relativity. He also wrote a number of popular science books, including "A Brief History of Time."
Hawking suffered for most of his life from amyotrophic lateral sclerosis, also known as ALS or Lou Gehrig's disease. ALS typically kills sufferers within the first few years, but Hawking survived the disease for decades.
Stephen Hawking's artificial voice appears on Pink Floyd track "Talkin' Hawkin'."
David Gilmour chose to sample Hawking originally after he saw the British Telecom advert. He said:
“This was the most powerful piece of television advertising that I’ve ever seen in my life, I don’t think he even wrote the words that they used with him, but … he was in it, in his wheelchair. He looks kind of strange. And I just found it so moving that I felt that I had to try and do something with it, or with him or something, in some way.”