“Normal science, the activity in which most scientists inevitably spend almost all their time, is predicated on the assumption that the scientific community knows what the world is like. Normal science often suppresses fundamental novelties because they are necessarily subversive of its basic commitments.”

—  Thomas Kuhn , book The Structure of Scientific Revolutions

Source: The Structure of Scientific Revolutions (1962), I. Introduction: A Role of History, p. 5

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Thomas Kuhn 27
American historian, physicist and philosopher 1922–1996

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