The development of science is driven, in normal periods of science, by adherence to a ‘paradigm’.
The functions of a paradigm are to supply puzzles for scientists to solve and to provide the tools for their solution.
A crisis in science arises when confidence is lost in the ability of the paradigm to solve particularly worrying puzzles called ‘anomalies’.
Crisis is followed by a scientific revolution if the existing paradigm is superseded by a rival.."
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