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"Set. Bang!" The runners shot from their marks. The announcer shouted, "Good start from Bolt! Bolt is leading. He's going away. He's going to win it by two meters. 9.58! The world record is gone!" 

This race took place in Berlin in 2009. Usain Bolt set the world record in the 100 meters. But that's not all. Four days later, he ran another race -- the 200 meters. 

"Set. Bang!" Bolt's long legs pulled him faster and farther in front. The announcer said, "He'...