The most familiar facts are often hardest to understand. This is described byWard as "the illusion of the near." Because of nearness we get no perspective;because of continual presence we become used to one view and fail to perceiveothers.To the consideration of new facts we come with comparatively open minds, impressed by each item and its relation to the rest; but facts long known aresupposed to be understood, and we resent the slight offered to our intelligence inthe proposal to reconsider. Yet the most revolutionary discoveries have been madeamong precisely the most familiar facts; as in the nature and use of steam, or theendless potentialities of coal tar.We had, and used, and supposed we knew, our own bodies, through longcenturies of living and dying, yet our late-learned physiology was able to show usfacts most vitally important which we had never dreamed of. Social phenomenahave been going on about us since we began to be human; they are as familiar asphysical or physiological phenomena, but even less understood. Yet the interactionof social forces and social conditions form increasingly prominent factors in humanlife
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