Mid-flight, the professor decides to play a game with the old man and prove he’s intellectually superior, so he turns to him and says:

“Hey, do you want to play a little game with me?”

The old man looks at him and says: “Depends. What type of game?”

The professor goes on to explain the game:

“Taking turns, we’ll ask each other one question at a time. If the other knows the answer, the asker gives him one dollar, and if he doesn’t, he gives one dollar to the asker. Want to play?”

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