We tend quite rightly to associate an age with its newest and most original ideas, and there is no harm in this as long as we remember that only a fe… - J. B. Priestley

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We tend quite rightly to associate an age with its newest and most original ideas, and there is no harm in this as long as we remember that only a few men, at that time, may have actually held those ideas, and that many decades, often amounting to centuries, may pass before those ideas have seeped down to wider and commoner levels of belief, thought, and feeling. So many 'hard-headed and realistic' men of today repeat what scientists were saying 100 years ago, and may know nothing about the outlook and prevailing moods of scientists today. And men in the street now assert beliefs originally found among the intellectuals of the 18th century. We may expect time-lags of various lengths.