Pyongyang says it hit a target 621 miles away in the sea
                                
                                
                                    (Newser) -
                                    For the second time in less than a week, North Korea says it has launched a hypersonic missile. After  launching one last Wednesday , Pyongyang said it did so again Tuesday, the  BBC  reports. This one "precisely hit" a target 621 miles away, the country says. The US, South Korea,...