It will hold 6K passengers with a crew of 2K
                                
                                
                                    (Newser) -
                                    The world's largest cruise ship just got its first taste of the open ocean, setting sail from France for a trial run on Thursday, the  Guardian  reports. The Harmony of the Seas, which will make its debut for Royal Caribbean International in May, is 1,187 feet long, 210...