Reviews Science & Society Guesstimation 2.0 Solving Today's Problems on the Back of a Napkin 2.0 by Lawrence Weinstein By Science News January 24, 2013 at 9:06 pm - More than 2 years ago Share this:Share Share via email (Opens in new window) Email Share on Facebook (Opens in new window) Facebook Share on Reddit (Opens in new window) Reddit Share on X (Opens in new window) X Print (Opens in new window) Print A handy guide helps readers learn to approximate almost anything, from the energy needed to ship a tomato to the length of toilet paper used in the United States. Princeton Univ., 2012, 359 p., $19.95