399485 02: Physicist Stephen Hawking smiles at a symposium to honor his birthday at the Center for Mathematical Sciences at the University of Cambridge January 11, 2002 in Cambridge, England. Hawking turned 60-years-old on January 8, 2002 and is the Lucasian Professor of Mathematics, a post once held by Sir Isaac Newton. (Photo by Sion Touhig/Getty Images)
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