A horse can destroy a human in a sprint, but over a brutal long haul in summer heat, Daniel Lieberman argues the advantage can flip: humans keep cooling themselves through sweat, while a horse’s larger body struggles to shed heat fast enough. - Space Daily

In a sprint, it is no contest. A horse would leave a human far behind before either had gone a hundred metres. But over a long, punishing distance in summer heat, the Harvard physiologist Daniel Lieberman argues, the advantage can flip. Humans keep cooling th…