Lam Kok was touring French vineyard he had just bought
                                
                                
                                    (Newser) -
                                    After a Chinese billionaire sealed the deal on a vineyard purchase, its previous owner took him for a helicopter tour—and the vehicle crashed. Now, Lam Kok is feared dead, the  BBC  reports. His 12-year-old son's body was retrieved from the wreckage,  Sky News  reports, but the other three...