With her epilepsy somewhat under control, Nicole sets her sights on racing a horse. She begins by exploring a theory known as “The Endurance Running Hypothesis.” To understand how this theory works, Nicole explores the long history of humans outracing four-legged animals, like persistence hunters that track and chase kudus in Namibia. Then she travels to Arizona to witness the human vs. horse races of today: meeting horse riders and ultramarathoners who compete alongside each other in impressive, 50-mile runs.  Learn more about your ad choices. Visit podcastchoices.com/adchoices