Earnhardt spoke Sunday at Darlington Raceway, two days after he and Hendrick Motorsports announced the sport's most popular driver would end his season as he continues recovery from concussion-like symptoms after a crash at Michigan in June. ''I have the passion and desire to drive,'' Earnhardt said. Dr. Micky Collins, medical director of the University of Pittsburgh Medical Center Sports Concussion Program, also treated Earnhardt four years ago. More...