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Stephen Hawking, in his office at England's Cambridge University last month, had to miss a cosmology conference held Sunday to celebrate his 70th birthday. (The Science Museum via Associated Press)

Stephen Hawking, in his office at England's Cambridge University last month, had to miss a cosmology conference held Sunday to celebrate his 70th birthday. (The Science Museum via Associated Press)

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Best combat rifles of all time

A combat rifle is a military service rifle that fires a full-power rifle cartridge, a mainstay of every modern army in the world. See the best combat rifles ever made.