A good friend who is in his sixties relates this recent experience: Sitting in the reception room of a new dentist, I noticed his certificate, which bore his full name, I remembered a tall, handsome boy with that name in my high school class about 46 years ago. But, after seeing a balding, gray-haired man with a deeply lined face I knew he was too old to have been my classmate. After he examined my teeth, I asked if he had attended the local high school. - "Yes," he replied. - "When did you graduate?" I asked. - He answered, "In 1956." - "Why, you were in my class!" I exclaimed. - He looked at me closely and then asked, "What did you teach?"