How much energy do Americans waste each year by throwing out the unused ice in their drinks? (Thanks to John Klinck of Old Dominion University for suggesting the question.)

Why is blood pressure measured on the upper arm? Does it really matter?

Look for the answers online at

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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