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This undated handout photo provided by the journal Science shows mature Atlantic tomcod at a NOAA rearing facility in Sandy Hook, New Jersey. Most people think of evolution occurring gradually over thousands of years, but apparently no one told the Atlantic Tomcod. Over the last half-century or so the Hudson River fish has evolved to become resistant to toxic PCB that polluted the river, researchers reported Thursday. (AP Photo/Science)

This undated handout photo provided by the journal Science shows mature Atlantic tomcod at a NOAA rearing facility in Sandy Hook, New Jersey. Most people think of evolution occurring gradually over thousands of years, but apparently no one told the Atlantic Tomcod. Over the last half-century or so the Hudson River fish has evolved to become resistant to toxic PCB that polluted the river, researchers reported Thursday. (AP Photo/Science)

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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.