How much weight would you lose climbing stairs every day (assuming that neither diet nor metabolism changes in response to the extra effort)? (Thanks to Alex Godunov of Old Dominion University for suggesting the question.)

The California Assembly voted to ban single-use hotel shampoo bottles. How much impact would this have if it was applied nationwide?

Look for the answers online at under “Browse,” current issue. 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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