How many trees began to bloom (flower) today in the U.S.? (Thanks to Radiolab for suggesting the question.)

How much energy does a human use in his/her lifetime? (Thanks to Robert Wiringa of Argonne National Lab for suggesting the question.)

Look for the answers online at tpt.aapt.org under “Browse,” at the very end of the 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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