Looking at Guesstimation

The WSJ's Numbers Guy looks at the new book: “Guesstimation: Solving the World’s Problems on the Back of a Cocktail Napkin” by Lawrence Weinstein and John A. Adam — a physicist and a mathematician, respectively — present dozens of such questions, followed by hints, their approach to finding a solution and a reality ... ". Guesstimation is an important skill, eventually you should get beyond the cocktail napkin.