Word: unknowns
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...cannon destroyed the feudal organization of society, because the baron's castle was not longer a refuge difficult to capture. The extent to which the recent progress in applied science will affect both the relation of men to one another and the interdependence of different peoples is as yet unknown; nor will it be wholly settled for a generation to come, even if no further scientific discoveries and inventions are made. Who will determine these new relations aright? Upon whom will the guidance for better or worse rest? Obviously upon the intelligent, the educated and the public spirited people...
...LaSalle man can walk in anywhere with confidence. He does not feel the uncertainty and fear that arise when one faces the new and unknown. Under the Problem Method he has explored his chosen field on his own feet--the questions, the problems, the difficulties--he has met, faced and conquered them...
...Eternal Triangle and the Triple Alliance". The Hindenburg line is still known only through the pages of the public press. But at last the voice of our opponents in the "late unpleasantness" is to be heard; the memoirs of the Ex-Kaiser (X standing as usual for the unknown) are shortly to be laid before the American public by the McClure Syndicate...
...case of a star of unknown distance whose spectrum has been photographed, the relative intensity of the lines is compared with a standard reduction curve, and the star is at once recognized as of a certain luminosity or absolute magnitude. The apparent brightness of this star, however, as seen from the earth will depend on its distance from us. The apparent brightness or magnitude is then determined either visually or photographically; and, knowing the actual brightness, the distance of the star is computed on the basis of the well known law of physics that the intensity of light varies inversely...
...extraordinarily beautiful girl, somehow related to "A", upon whom suspicion is cast by the local police; while "C" is the famous detective who solves the various "mysterious", or "sinister", forces--"Z to the nth power"--which surround the murder and emanate from "X", the villain or unknown quantity. The formula is then derived by cancelling "A" with "Z to the nth power", subtracting "X", squaring "B" and adding "C", with as many other factors as the ingenuity of the author can devise...