This is a story about sweat, survival, speed, and the peculiar ways running may have shaped us as humans. Armed with a hydration vest, a dream, and paleoanthropologist Daniel Lieberman's endurance running hypothesis, filmmaker Nicole Teeny set out to push the limits of her own endurance. Nicole's mission takes her from the Kalahari Desert to Kansas to see if humans really did evolve to run. Along the way, she discovers humans' unusual superpower and asks, can a human outrun a horse?

This episode was written and produced by Nicole Teeny. Sound designed and produced by Ray Pang. Edited by Audrey Quinn. Our host and executive producer is Meredith Johnson.

Want more of this story? Listen to Nicole's four-episode series on ESPN's 30 for 30 podcast!

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