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Human Speed Limit? We're Nowhere Near It

04:07
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    Jamaica's Usain Bolt (right) won the men's 100-meter final race in the world track and field championships Sunday in Berlin in 9.58 seconds, just ahead of the U.S.'s Tyson Gay. (AFP/Getty Images)
    Jamaica's Usain Bolt (right) won the men's 100-meter final race in the world track and field championships Sunday in Berlin in 9.58 seconds, just ahead of the U.S.'s Tyson Gay. (AFP/Getty Images)

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