We are creatures built for joy. At the very saddest funerals, we can hear a funny story about our lost beloved, and, God help us, we laugh. We can stagger out of an appointment where a person in a white coat has given us the news we think we cannot bear to hear, and still we smile at the baby in the checkout line clapping her chubby hands at the balloons by the cash register or kicking her feet in pleasure at the sight of a stranger’s smile.
