Nobody knows. It may well be that the limits stretch so far beyond present needs, that such gloomy speculations are unjustified. Yet one salient fact commands attention: by speeding up change in the outer world, we compel the individual to relearn his environment at every moment. This, in itself, places a new demand on the nervous system. The people of the past, adapting to comparatively stable environments, maintained longer-lasting ties with their own inner conceptions of "the-way-things-are." We, moving into high-transience society, are forced to truncate these relationships. Just as we
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