Feds expected to report inadequate plates
                                
                                
                                    (Newser) -
                                    The Minneapolis bridge that failed last summer, killing 13 people, had fatal design flaws, the NTSB announced today. Steel gusset plates that held together beams on the eight-lane bridge were half the thickness they should have been, investigators found. While the agency didn't say the gusset plates caused the collapse,...