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One time when I was in school I was seated in the office of my advisor, a brilliant and funny physicist. In the middle of one of his sentences something on his whiteboard distracted him. It looked much like this:

He started thinking out loud: “A, B, and pi-zero … A, B, and pi-zero … what was I doing? Was I working on quantum mechanics? What was … Wait! That’s not a pi-zero! That’s a goat!” The professor had been explaining the “Monty Hall Problem” to a student earlier in the day.
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