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Published online by Cambridge University Press: 14 August 2015
Studies of galaxies during the last seventy years have turned up a large array of peculiar objects. Vigorous work on these was rare until a few years ago when quasars were discovered. It then became clear that an understanding of quasars might come from an understanding of the less-extreme peculiar galaxies. It was further clear that even the physical processes occurring in nuclei of peculiar galaxies were far from easy to understand.