Thanks to Les Johnson of NASA, to Rania Habib at Syracuse University, to David DeGraff of Alfred University, and to Walter Cuirle. Also my special appreciation to Frank Manning, formerly of NASA, and my son Christopher McDevitt for advice and technical assistance. Any blunders are on my plate. I’m also indebted to Ginjer Buchanan, my editor, and to Sara and Bob Schwager for their contributions. To my agent, Chris Lotts. And as always to my wife, Maureen, who continues to serve as in-house editor and general inspiration.