“Give us enough time, and there’s nothing on earth we can’t run down. This is persistence hunting, and it’s still practiced today. In the heat of the Kalahari desert, hunters select a kudu, and just go after it. It will bolt, and initially escape capture. But pursued a moderate run pace—something akin to a marathon runner’s stride—the animal can’t stay ahead. It must stop to rest, and denied the opportunity, simply keels over with exhaustion, and is speared. The hunters don’t need to rest; humans are endowed with an unmatched ability to cool down. Our sparse body hair and numerous sweat glands are our true evolutionary accomplishment. We can even outrace a horse over a long enough distance.”

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