Our breath catches and we jump in fear at the sight of a snake. We pause and marvel at the sublime beauty of a sunrise. These reactions are no accident; in fact, many of our human responses to nature are steeped in our deep evolutionary past-we fear snakes because of the danger of venom or constriction, and we welcome the assurances of the sunrise as the predatory dangers of the dark night disappear. Many of our aesthetic preferences-from the kinds...