Exotic processes in nuclear physics

This review is concerned with the modes of radioactivity and some other nuclear physics phenomena discovered comparatively a short time ago or long ago but simply less familiar that have something extraordinary about them either in terms of properties or in terms of observation (rare or even 'forbidden' occurrence, serendipitous discovery posing observational or interpretation challenges, requiring unique experimentation, or exotic in some other manner). The history of the discovery of such phenomena is presented, and their significance is discussed. (reviews of topical problems)