A friend of mine asked me how not to worry about the cat, which had some mild symptoms of illness, but nothing that looked severe enough to take the cat to the veterinarian. She also thought the symptoms were so subtle that they might not be easy to describe to the vet, but still she worried. I finally said to her, "You must do something." "That's just the problem, there's nothing to do," she said. "Take some kind of action," I said. "Call the vet and talk to him." "That doesn't make sense because the vet wouldn't know anything from what I told him, and he'd probably ask me to take her in to see him, and I know it's not that serious," she said. "Yes, I understand," I said, "But you should take the action for you, not for the car or the vet. By not doing anything you're keeping yourself trapped in worrying." "Okay," she said. "I see what you mean." When she called ...