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In times of drought, restaurants help conserve water by not automatically serving water to patrons. How much water does this save? Is this a little or a lot? (Thanks to Rex Tayloe of Indiana University for suggesting this question.)
How much energy does it take to make one Google search? How much does that energy cost? (Thanks to Yaohang Li of Old Dominion University for suggesting the question.)
Look for the answers online at tpt.aapt.org. Question suggestions are always welcome! For more Fermi questions and answers, see the now available Guesstimation 2.0: Solving Today's Problems on the Back of a Napkin, by Lawrence Weinstein (Princeton University Press, 2012).
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