 The new paradigm overturns the old by displacing it as no longer a competent guide to future research. In the famous (or notorious)chapter X of Structure, Kuhn claims that the change is typically so radical that the two paradigms cannot be compared against the same goals and methodological standards and values. Moreover, the accompanying meaning shift of key terms, such as ‘simultaneous’, ‘mass’, and ‘force’ in physics, leads to communication breakdown. In effect, scientists on different sides of a paradigm debate “live in different worlds.” Kuhn speaks of scientists experiencing a kind of gestalt switch or religious conversion experience. The heated rhetoric of debate and the resulting social reorganization, he says, resemble those of a political revolution. “Like the choice between political institutions, that between competing paradigms proves to be a choice between incompatible modes of community life” (1970, 94). The comparison of scientific with political revolutions should not surprise, given the entangled history of the term ‘revolution’, but claiming such close similarity enraged philosophical and cultural critics of Kuhn.