Manteo Mitchell keeps men's 4x400 gold hopes alive
                                
                                
                                    (Newser) -
                                    The US made it to the men's 4x400-meter relay finals with the help of a runner who deserves a gold medal for pain endurance. Manteo Mitchell was 200 meters into the race's first leg when a bone in his leg snapped. He managed to finish the rest of...