 Attempts to define what we today call science have a long history, and the roots of the demarcation problem have sometimes been traced back to Aristotle’s Posterior Analytics (Laudan 1983). Cicero’s arguments for dismissing certain methods of divination in his De divinatione has considerable similarities with modern criteria for the demarcation of science (Fernandez-Beanato 2020).  However it was not until the 20th century that influential definitions of science have contrasted it against pseudoscience. Philosophical work on the demarcation problem seems to have waned after Laudan’s (1983) much noted death certificate according to which there is no hope of finding a necessary and sufficient criterion of something as heterogeneous as scientific methodology. In more recent years, the problem has been revitalized. Philosophers attesting to its vitality maintain that the concept can be clarified by other means than necessary and sufficient criteria (Pigliucci 2013; Mahner 2013) or that such a definition is indeed possible although it has to be supplemented with discipline-specific criteria in order to become fully operative (Hansson 2013).