HE stands 196cm and weighs 75kg. That makes him a very big man! And today Usain Bolt is the fastest man in the world. The 21-year-old Jamaican (牙买加人) ran a world record 9.72 seconds. It was in the 100 meters in the Reebok Grand Prix meet (锐步田径大奖赛) in New York on May 31.