A new kind of modern airplane was on an experimental flight. It was full of reporters and journalists. A few minutes after the takeoff the captain's voice was heard from the loudspeakers: "I'm delighted to be your pilot, and the captain of this airplane on its first historical flight. I can tell you that the flight is going well. Nevertheless, I still have to tell you about a minor inconvenience that has occurred. The passengers that are sitting on the right side can, if they look through the window, see that the closest engine is slightly vibrating. That shouldn't worry you, because there are four engines, so you can feel perfectly safe. And, we are at the unbelievable altitude of 62,000 feet, flying at a speed of 1,050 mph as planned . . . But, if you're looking at that engine, maybe you…