When the first snowboarder catches air and turns in the half pipe cut into the side of a Canadian mountain in February's Winter Olympic Games, the obstacle between them and a gold medal is a row of human judges. But the day is coming when machines will be able to decide whether the move was good, or the athlete fluffed it.
For the past 70 years, the Olympic organisers have slowly brought more and more technology to try to make sure the gold medal goes to the right person.
It used to be so simple. In the 1930s, a technician from the Swiss watchmaker Omega turned up with 27 stopwatches that had to be used for all the Games. To time the cross-country skiing event, judges had to synchronise two timers and then send one of the judges off on their skis to the start line to write down the time each contestant started off.