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Late scientist Carl Sagan is famous for the long-running "Cosmos" educational series on TV. (Associated Press)

Late scientist Carl Sagan is famous for the long-running "Cosmos" educational series on TV. (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.