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The genetic secret to becoming a better runner
Sometimes, hard work just isn't enough
 
Runners compete at the 2000 Olympics: Screening for female gender was banned before the 2000 games for scientific and ethical reasons, but may soon be resurrected.
Runners compete at the 2000 Olympics: Screening for female gender was banned before the 2000 games for scientific and ethical reasons, but may soon be resurrected.
Pascal Le Segretain/Sygma/Corbis
 

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