Question: The great physicist Enrico Fermi used to test the problem-solving ability of his students at the University of Chicago by giving them the following problem:

The great physicist Enrico Fermi used to test the problem-solving ability of his students at the University of Chicago by giving them the following problem: How many piano tuners are there in the city of Chicago? (Assume the population of Chicago is 5 million people.) (Plausible answers: 50–250 tuners⁶)

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