How Fast Can Humans Go?: "Usain Bolt may have just broken the human speed limit. Last week, he took two gold medals in the Olympic 100m, shattering his own world record with a time of 9.69 secs., and the 200m with a time of 19.3 secs., obliterating by two-hundredths of a second the long-standing world record Michael Johnson set at the Atlanta Games in 1996."
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