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April 21, 2008: Dr. Stephen Hawking giving a lecture related to NASA's 50th anniversary at George Washington University in Washington, D.C.![Stephen Hawking]()
Stephen Hawking in July 1999.![Stephen Hawking]()
Stephen Hawking attended to by a nurse during a visit to Hong Kong in June 2006.![Stephen Hawking]()
April 2008: Stephen Hawking makes remarks at an event marking the 50th anniversary of NASA at George Washington University in Washington, D.C.![Stephen Hawking]()
Stephen Hawking answers questions during an interview in Orlando, Fla., in April 2006, related to his zero-gravity flight.![Stephen Hawking]()
Stephen Hawking in January 2008.![Stephen Hawking]()
Stephen Hawking floats in zero gravity during a 'vomit comet' flight over Florida in April 2006.
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- Stephen Hawking
