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Scientists, celebs remember Stephen Hawking

Professor Stephen Hawking at a news conference at

Professor Stephen Hawking at a news conference at the University of Potsdam, near Berlin, Germany, on July 21, 1999. Photo Credit: AP/Markus Schreiber

As news of the brilliant physicist Stephen Hawking's passing at the age of 76 spread, scientists, celebrities and more shared their condolences on Twitter.

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