Guesstimation 2.0: Solving Today's Problems on the Back of a NapkinEbookGuesstimation 2.0: Solving Today's Problems on the Back of a NapkinbyLawrence WeinsteinRating: 4 out of 5 stars4/5Save Guesstimation 2.0: Solving Today's Problems on the Back of a Napkin for later