Amputee sprinter Oscar Pistorius, known as the world's "fastest man on no legs", is understandably nervous ahead of his first race abroad against able-bodied athletes, due to take place in Rome on Friday. But how he races, scientifically speaking, could be far more important than who crosses the finish line first. Scientists working for the world's sports governing body will be analysing Pistorius to see whether his carbon-fibre limbs are giving him an unfair edge that allows him to perform beyond his natural ability. Essentially, they want to know if he's cheating. And their conclusions could make or break Pistorius's...