It's race day. A young athlete walks onto the track and takes his place next to the other runners. The starting gun fires, and the young athlete begins to run. As the group races down the track, the crowd begins to cheer. The young athlete passes the first runner. Then he passes another, and yet another. The finish line comes near, and the young athlete rushes forward with great speed. He crosses the finish line to the loud roar of the crowd. Who is this young athlete? He is south African sprinter Oscar pistorius. Why is the crowd cheering so loudly? Pistorius has two artificial legs, and he has won the race against able-bodied runners.