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NASA's muscular R2 astronaut "helper" robot has announced by Twitter that it has no gender. (NASA photo)

NASA's muscular R2 astronaut "helper" robot has announced by Twitter that it has no gender. (NASA photo)

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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.