A new kind of plane was on its first flight. It was full of reporters and journalists. A little while after takeoff, the captain's voice was heard over the speakers. "Ladies and gentlemen, I'm delighted to be your pilot for this plane's historic first flight. I can tell you the flight is going well. Nevertheless, I have to tell you about a minor inconvenience that has occurred. The passengers on the right side can, if they look out their window, see that the closest engine is slightly vibrating. That shouldn't worry you, because this plane is equipped with four engines and we are flying along smoothly at an acceptable altitude. As long as you are looking out the right side, you might as well look at the other engine on that side. You will notice that it is glowing, or more precisely one sh…