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The Best Record in Sports: 8.99 100m

Usain Bolt is the fastest human who's ever lived. But his record will be broken.

Updated: July 7, 2010, 7:43 AM ET
By John Brenkus | ESPN The Magazine

This story appears in the July 12 issue of ESPN The Magazine and was adapted from a chapter of "The Perfection Point: Sport Science Predicts the Fastest Man, the Highest Jump and the Limits of Athletic Performance," by John Brenkus.

Give even a moment'sthought to the limits of human potential and you have to wonder: How fast is it possible for someone to move over flat ground using nothing but his own two legs?

There are dozens of different competitive running ...

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