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Robert H. Edwards's Blog: Great 20th century mysteries - D. B. Cooper and Flight 305: piano tuners in Chicago - December 15, 2022 10:39
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Sources And Methods: 2015-09-06
SOLVED:You're writing a biography of the physicist Enrico Fermi, who was fond of estimation problems. Here's one problem Fermi posed: What's the number of piano tuners in Chicago? Give your estimate, and
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