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Excellent history of the challenger disaster from an engineering and ethical perspective. Alan Mcdonald, the author of this book was the engineer/manager who directed the solid rocket booster (SRB) program for Thiokol. He was also one of three Thiokol engineers who, on the eve of the ill-fated challenger launch, warned against launching until the ambient temperature at the launch site was at a level that the O-ring sealed joints on the SRB could function safely. On the eve of launch the air temperature was sub-freezing while engineers at Thiokol had taken the position that a temperature of 53F was the minimum for a safe launch.