One evening years ago a speaker who was visiting the United States wanted to make a telephone call. He entered a phone booth, but found it to be different from those in his own country. It was beginning to get dark, so he had difficulty finding the number in the directory. He noticed that there was a light in the ceiling, but he didn't know how to turn it on. As he tried again to find the number in the fading twilight, a passerby noted …