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Blind writers , students , and other interested readers now have access to this important reference tool , which lists more than 22,500 quotations , sayings , and writings of English and American authors . Others are sent to an outside reference laboratory with results returned eletronically . If students have an interest in working for a particular type of business or office , arrangements could be made so that students may visit that type of office and be orientated to any special reference materials and knowledge associated with it . " Although measured copper levels were twice as high near the discharge compared to an upstream reference site , five of the six aquatic life indicators showed more diverse , or at least as diverse , community at the discharge site , " Reash said . It is one of the great feats of human intellect to have understood all this as consequences of two very simple ideas : the principle of relativity , which states that physical laws ought to be the same for all frames of reference , regardless of their uniform motion with respect to each other , and the constancy of the speed of light as measured in any reference system , no matter what its state of motion relative to some other reference system .