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Let us assume that crises are a ... Let us assume that crises are a necessary precondition for the emergence of novel theories, and next ask how scientists respond to their existence. Part of the answer, as obvious as it is important, can be discovered by noting first what scientists never do when confronted by even severe and prolonged anomalies. Though they may begin to lose faith and then to consider alternatives, they do not renounce the paradigm that has led them into crisis. Thomas Kuhn The Structure of Scientific Revolutions