(REUTERS)  The cockpit voice recorder from EgyptAir flight MS804 has been retrieved by search teams in a breakthrough for investigators seeking to explain what caused the plane to crash into the sea killing all 66 people on board. The Airbus A320 plunged into the Mediterranean early on May 19 on its way from Paris to Cairo. Since then, search teams have worked against the clock to recover the two black box recorders crucial to explaining […]