But there is a different kind of revolution, one that unfolds more modestly, almost imperceptibly. The new ideology might start in only a small number of classrooms, or magazines, or bureaucracies. You might notice it spreading, but comfort yourself that it’s prevalent only among people below a certain age, and so they’ll grow out of it; or popular only among people who work in certain industries or certain parts of the country. You tell yourself that those people all live in a “bubble,” and that it’s never long before bubbles pop. You’re confident it’s just a fad, and that it’s never long
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