Retired Formula One champion Michael Schumacher's condition was stable overnight, but the brain injury he suffered during a skiing accident in the French Alps is still critical, his manager said Wednesday. Sabine Kehm told reporters that his condition has not changed since doctors said he showed small signs of improvement on Tuesday. Schumacher, who turns 45 on Friday, suffered critical head injuries when he fell and struck a rock while skiing. He has since undergone two brain operations and remains in a medically induced coma.