This paper provides a new criterion to distinguish the genuine science from the pseudoscience. Morita (2008; 2009) discussed that there are two demarcation criteria between science and pseudo-science: experimental and theoretical. In this essay, I focus on the theoretical criterion. This criterion is an application of a new view of scientific explanation shown in Morita (2007; 2008 ch. 1). The point is that scientific explanation must unify the phenomena in question into common framework, and new elements which is added to model in order to deduce explicandum must be observable or be able to promote unification.
