I was reminded that everything wears out eventually when I dressed this morning. I grabbed a pair of undies with a few minuscule-sized tears along the band. Mid-afternoon saw one widened to about a 5-6" smile. By the time school had let out, that one was a good 8" across and working hard to join one that was by then golf ball sized.
I had no idea that grading papers at one's desk was quite so strenuous an activity.