Naturally the physicist and the engineer start talking about higher mathematics and their professions and start arguing whose profession is the most important. The physicist points out the window and says "You see those wings? Without the physics of aerodynamics those wouldn't be possible." Not to be outdone, the engineer points to the cockpit and says "You see all those controls and flight mechanisms? We wouldn't even be off the ground without those." After listening to them boast for about a half an hour, the mailman says "Without the mailman neither of you would be alive."
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