Learning from loneliness

From The Atlantic: "As social animals, we depend on others for survival. Our communities provide mutual aid and protection. 'We have survived as a species not because we're fast or strong or have natural weapons in our fingertips, but because of social protection,' said John Cacioppo of the University of Chicago. Early humans, for example, could take down large mammals only by hunting in groups. Cacioppo proposes that the root of social ties lies in their opposite — loneliness; the pain of being alone motivates us to seek the safety of companionship, which in turn benefits the species by encouraging group cooperation and protection.