Doctor Fred Nelson appeared on Thursday night's episode of 'Jeopardy!' with the late Alex Trebek.
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Nelson knew the answers and the questions as he advanced to a second-day on America's Favorite Quiz Show.
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Nelson even got to share a personal and lighthearted moment with the beloved host.
He joked that people at home may not recognize him in a suit and tie.
The Liberal Studies professor and chair is known for his shorts, sandals and Hawaiian shirts.
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It is safe to say his students have learned a thing or two from Doctor Nelson. He went on to win Final Jeopardy on Thursday night and took home $20,000.
Doctor Nelson will be on Friday's episode again, playing in the next round.
The final episode of 'Jeopardy!' featuring Alex Trebek will air on Christmas Day - December 25th.