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Stephen Hawking

In this photo provided by NASA, Dr. Stephen Hawking, a professor of mathematics at the University of Cambridge, delivers a speech entitled “Why we should go into space” during a lecture that is part of a series honoring NASA’s 50th Anniversary, Monday, April 21, 2008, at George Washington University’s Morton Auditorium in Washington. (AP Photo/NASA, Paul E. Alers) **MANDATORY CREDIT**

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