I know a man who drives 600 yards to work. I know a woman who gets in her car to go a quarter of a mile to a college gymnasium to walk on a treadmill, then complains passionately about the difficulty of finding a parking space. When I asked her once why she didn't walk to the gym and do five minutes less on the treadmill, she looked at me as if I were being willfully provocative. 'Because I have a program for the treadmill,' she explained. 'It records my distance and speed, and I can adjust it for degree of difficulty.' It hadn't occurred to me how thoughtlessly deficient nature is in this regard.