ANairport is an excellent spot for viewing the entire human emotional spectrum. As travelers arrive and depart, you can see the woman who is very apprehensive about flying pinching the fleshy part of her hand for reassurance, as if she were saying to herself, “It’s going to be all right.” In the same manner people say, “I had to pinch myself to make sure that it wasn’t a dream.” A male waiting for departure time may also be unsure about flying. However, he is sitting in a rigid, upright position with his ankles locked. His hands are clenched together, making one big fist, while he rhythmically massages one thumb against the other on top of his interlocked hands. These gestures indicate a nervous attitude...