The secret of the world's greatest sprinters revealed: Researchers find top Jamaican athletes have symmetrical KNEES

Usain Bolt of Jamaica (L) and Justin Gatlin of the United States compete in the Men's 100 metres Final  during Day Two of the 14th IAAF World Athletics Championships Moscow 2013 at Luzhniki Stadium on August 11, 2013 in Moscow, Russia.  (Photo by Cameron Spencer/Getty Images)
Rutgers researchers found those with the most symmetrical knees have the best times - and this was particularly true of the 100-meter sprinters in Jamaica.

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