Elemental human capacities like friendship and love, teaching and learning, have tremendous, constant, practical force. We don’t think of these in terms of what has given our species the grit to endure through hard times and even evolve in the long run. They’re lived social intelligence, part of the everyday, and so can be hard to see as serious amidst the high tumult of our age. But these kinds of human qualities are what sociologist Nicholas Christakis studies from his Human Nature Lab at Yale and his life generously lived. He offers a wide lens, a broad perspective, that deepens and refreshes.