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** FILE ** This undated image provided by the U.S. National Cancer Institute shows the 46 human chromosomes, where DNA resides and does its work. Most people know that DNA contains genes, which hold the instructions for life, but scientists are trying to more fully understand DNA. (Associated Press)

** FILE ** This undated image provided by the U.S. National Cancer Institute shows the 46 human chromosomes, where DNA resides and does its work. Most people know that DNA contains genes, which hold the instructions for life, but scientists are trying to more fully understand DNA. (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.