It is nearly impossible to write a book that depends on a continuous stream of scientific and historical facts without tripping a few times. I extend heartfelt thanks to my old friends and colleagues, nuclear physicists Dr. Douglas E. Wrege, Dr. Don S. Harmer, and Dr. Monte V. Davis for checking the manuscript for technical accuracy and clarity. Without them, I would have placed Denmark on the wrong side of Germany and referred to radium when I meant radon. Special thanks to Monte’s wife, Nancy Davis, who killed several hundred hyphens, and to James Coleman, with whom I drew pay for many years at the Georgia Tech Research Institute, for evaluating the manuscript for readability. Thanks to Robert Boyd, retired health physicist from the Georgia Tech Research Reactor, for providing a wealth of rare information concerning the Georgia Nuclear Laboratory, and to Gene Greneker for all the time we spent exploring the site. This book would not have been possible without the editing help of my wife, Carolyn Mahaffey, who majored in English, and, of course, without Jessica Case of Pegasus. Thanks also to Jodie Rhodes, the best literary agent in the world.