The first precise pendulum clock imported into North America failed to keep accurate time. How much does the local variation in effective g affect time keeping?

When we order coffee pods, we now receive a large envelope to send the used pods back for recycling. Should we recycle the pods? (Thanks to Sebastian Kuhn of Old Dominion University for prompting the question.)

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Question suggestions are always welcome!

For more Fermi questions and answers, see Guesstimation 2.0: Solving Today’s Problems on the Back of a Napkin, by Lawrence Weinstein (Princeton University Press, 2012).

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