If it can go wrong, it will--thus Murphy's Law. Science journalist Edward Tenner looks more closely at this eternal verity, named after a U.S. Air Force captain who, during a test of rocket-sled deceleration, noticed that critical gauges had been improperly set and concluded, "If there's more than one way to do a job and one of those ways will end in disaster, then somebody will do it that way." Tenner concurs, and he gives us myriad case studies of how technological fixes often create bigger problems than the ones they were meant to solve in the first place. Edward Tenner, former executive editor for physical science and history at Princeton University Press, holds a visiting research appointment in the Department of Geological and Geophysical Sciences at Princeton University. He received the A.B. from Princeton and the Ph.D. in history from the University of Chicago and has held visiting research positions at Rutgers University and the Institute for Advanced Study