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Robonaut 2 robots are seen in July 2009 in Houston. The Robonaut 2 taking off Wednesday for the International Space Station will stay there until the station stops operating after 2020. (NASA photograph via Associated Press)

Robonaut 2 robots are seen in July 2009 in Houston. The Robonaut 2 taking off Wednesday for the International Space Station will stay there until the station stops operating after 2020. (NASA photograph 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.