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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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TED-Ed - New TED-Ed lesson: How many piano tuners do you think there are in Chicago? Learn how you might make a good estimate. http://ed.ted.com/lessons/michael-mitchell-a-clever-way-to-estimate-enormous-numbers | Facebook
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