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The Mars rover Curiosity holds a scoop of powdered rock. The rover recently drilled into a Martian rock for the first time and transferred a pinch of powder to its instruments to analyze the chemical makeup. (AP Photo/NASA)
Photo by: HOPD
The Mars rover Curiosity holds a scoop of powdered rock. The rover recently drilled into a Martian rock for the first time and transferred a pinch of powder to its instruments to analyze the chemical makeup. (AP Photo/NASA)

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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.