I cried only once during the twenty-one-hour flight. I was looking out the window at the moon and thinking of the last long trip I took across the sky, and of the person who went with me and didn't come back. For a while, it was as poisonous and wrenching as it had been since the day it happened, as intolerable: a crime against nature. Then the grief went back to sleep in my body. And it was again nature herself. Nature. Mother Nature. She is free to do whatever she chooses.