What can slightly-sweaty primates teach us about that uber-sweaty primate, Homo sapiens? Above: Chimpanzee. Photo by Jill Preutz. Right: Elite human marathoner. Photo by Scott Mason Photography. When you think about what separates humans from other animals you’d probably answer with intelligence, big brains, or walking on two legs. You may even recognize our (almost) naked skin as conspicuous. You’d be right about all these things but you’re forgetting one: sweating. Our t