Usain Bolt broke the world record for running 100 meters again today, at the IAAF Athletics World Championships in Berlin.
At the Olympics, Bolt slowed down and started celebrating before crossing the finish line. This time, Tyson Gay was in the lane next to him and finished close behind him. If Bolt didn’t exist, Gay would hold the world record. And if Gay didn’t exist, Bolt wouldn’t have run so fast.
