Alfred W. Crosby is a Professor Emeritus in American Studies, History and Geography at the University of Texas, Austin, where he taught for over twenty years. His previous books include America's Forgotten Pandemic: The Influenza of 1918, 2nd edition (Cambridge, 2003), Throwing Fire: Projectile Technology through History (Cambridge, 2002), The Measure of Reality: Quantification and Western Society, 1250 1600 (Cambridge, 1997). The Measure of Reality was chosen by the Los Angeles Times as one of the 100 most important books of 1997.