A student visited his old school, 20 years after his graduation, and met an old Science professor of his. The professor happened to be grading exam papers, and the student was surprise to notice that the questions were exactly the same as they were two decades ago. He asked the professor about the possibility of the leakage of the exam paper such that the students would have known the questions in advance. The professor smiled wryly and answered, "Don't worry about that, my dear boy. I've changed the answers every year." |