The Science of Speed

From spine to skull, a cheetah's body is perfectly designed for running.

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EDITOR'S NOTE: The cheetah, named Sahara ("Sarah"), died January 21, 2016, at age 15. She lived at the Cincinnati Zoo and Botanical Garden and set the world record for fastest land animal in 2012, running 100 meters in 5.95 seconds and reaching a top speed of 61 miles an hour.