A paradigm shift occurs when scientists stick to their model of reality (theory), while evidence begins to pile up that doesn 't fit in there. Often a group of relative outsiders is needed, for example a younger generation of scientists or scientists from a different discipline, who are first seen as a 'dissidents ', who then come up with a theory or model that explains the old facts, but also the new evidence that was beyond the old paradigm. When the entire scientific movement finally must come about, a paradigm shift has occurred. Usually such discontinuous shifts take many years. But in the current Corona crisis, we see such a shift taking place within a few months. What 's up with that?