Researchers believe contamination comes from corn syrup
                                
                                
                                    (Newser) -
                                    A test of some of America's most popular processed foods has turned up trace amounts of mercury, the Minneapolis Star-Tribune reports. Researchers believe that the mercury, found in levels far lower than in seafood, comes from plants that use caustic soda laced with mercury to produce high-fructose corn syrup, widely...