They hope 3-day strike will give them the upper hand in contract negotiations
                                
                                
                                    (Newser) -
                                    Some 15,000 nurses in Minnesota have walked off the job in what the  Washington Post  calls "the largest strike of private-sector nurses in US history," with some of 15 affected hospitals preparing for delays despite efforts to recruit traveling nurses. The three-day strike, which began Monday, comes...