Steven E. Landsburg is a Professor of Economics at the University of Rochester. He is the author of "The Armchair Economist, Fair Play, More Sex is Safer Sex, The Big Questions, " two textbooks in economics, a forthcoming textbook on general relativity and cosmology, and over 30 journal articles in mathematics, economics and philosophy. His current research is in the area of quantum game theory. He blogs daily at www.TheBigQuestions.com. For over ten years, he wrote the monthly "Everyday Economics" column in "Slate" magazine, and has written regularly for "Forbes" and occasionally for the "New...