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The Key to the Cheetah's Speed

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Pitting athlete Usain Bolt against a cheetah may not be a fair comparison, especially since in 2009 a cheetah named Sarah bested Bolt's record-breaking 9.69-second 100-meter dash by a good 3 seconds, scientists now know what makes the swift feline faster than similarly built speedsters.In addition to having longer stride lengths, cheetahs can increase the number of strides they make per second as they accelerate.

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