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This book is the first to examine the arguments and behaviour of the scientists who have been locked in conflict for a decade over two competing hypotheses for the cause of the mass extinction, some 65 million years ago, of most of life on earth, including the dinosaurs. These papers - by historians, sociologists, philosophers, and participating scientists - provide an exceptional opportunity to observe firsthand the workings of science that in quieter times are hidden from view. The book concludes with an overarching discussion by a balanced panel of embattled scientists and scholars.