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Explaining The Blazing Speed Of Contemporary Marathoners

The men's leaders in the New York City Marathon cross the Pulaski Bridge running toward the borough of Queens on Sunday. The winner, Geoffrey Mutai, of Kenya, is at center rear, in green. (AP)
The men's leaders in the New York City Marathon cross the Pulaski Bridge running toward the borough of Queens on Sunday. The winner, Geoffrey Mutai, of Kenya, is at center rear, in green. (AP)

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