Tragedy mixed with triumph at the Kentucky Derby on Saturday, when filly Eight Belles broke two ankles and had to be euthanized on the track. It is the second time in three years that a horse has gone down at the event, raising questions about breeding thoroughbreds for highly competitive racing.
Andrew Beyer, sports columnist for The Washington Post
Dr. Rick Arthur, equine medical director, California Horse Racing Board
Julie Rovner, NPR's health policy correspondent