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What were Stephen Hawking's greatest contributions to science?
Famed physicist Stephen Hawking took gravity to its ultimate limits. In doing so, he made a number of significant ...
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10 facts about Stephen Hawking you didn't know that may surprise you
In Stephen Hawking: A Biography by Kristine Larsen ... Hawking used an infrared switch mounted on his glasses that generated words by detecting cheek movement. His now world-famous American ...