How much total time do Americans spend texting every year?

Can a typical human open a 20-ton door (swinging on hinges around a vertical axis like a normal room door) with no mechanical assistance?

Look for the answers online at tpt.aapt.org. 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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