"The other day I met a man who didn't know where Tripoli was. Tripoli happened to come into the conversation, and he was evidently at a loss. "Let's see," he said. "Tripoli is just down by the - er - you know. What's the name of that place?" "That's right," I answered, "just opposite, Thingumabob. I could show you in a minute on a map. It's near - what do they call it?" At this moment the train stopped, and I got out and went straight home to look at my atlas."