7-time champ, at 41, will drive for Mercedes
                                
                                
                                    (Newser) -
                                    Legendary driver Michael Schumacher will return full-time next year to the Formula One circuit, where he won seven championships in the 1990s and this decade. The German, 40, retired after the 2006 season, and attempted a comeback for his former team, Ferrari, after one of its drivers was injured in...