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spec: The mechanism for stipulating guarantees operates as follows : when the user selects one or more guarantees on layer n of the hierarchy those guarantees are automatically selected on everything which falls beneath layer n in the hierarchy . Federalism is working well in Germany , probably because of several important historical characteristics that preceded the founding of the Federal Republic in 1949 - - a socially and culturally homogeneous population , a tradition of federalism going back several centuries , a strong sense of nationalism , and institutional experience with federal processes . In Not Just Black and White , Nancy Foner and George M. Fredrickson bring together a distinguished group of social scientists and historians to consider the relationship between immigration and the ways in which concepts of race and ethnicity have evolved in the United States from the end of the nineteenth century to the present . Those `` slices '' then were combined and interpreted by computer software to create the 3-D image showing not only the embryo 's exterior but also its internal features . But the Three Gorges project is just one of nearly 800,000 dams worldwide , and one of 45,000 large dams ( defined as those over 50 feet high or having a reservoir volume greater than four million cubic yards ) that have been built over the last century , according to a report released last week by the World Commission on Dams . The gift , announced last year , will assist in positioning the college as a national leader in scholarly research , creative work , outreach and teaching as it prepares students for communication in the 21st century . When a purely speculative discovery is announced to the public , it cannot be done with too much prudence . He answered me by letter in the most unreserved manner , and that not for himself only , but for the Minister , with whose knowledge the letter was declared to be written . Most people imagined that the design would involve a casting like the bells . But if you believe environment includes this cultural pattern that goes back centuries before they were born , then no , they're not in the same environment . Map Machine features political , physical maps and a Virtual Earth , an animation showing three rotating globes representing physical , political , and remote sensing views of the earth . '' Of the original eight subspecies , the Bali , Caspian , and Javan are now extinct . " Verne did not develop his idea further , and subsequent science fiction writers made little use of it for nearly a century . Our visit to town was an opportunity to stroll its narrow and steep streets , stop at the square abutting the town ’ s walls , do a bit of shopping , visit the museum of the Etruscan Academy or view the interior of the Cathedral and its many 16 th-18 th century A.D. paintings . Oxford has been a rich backdrop for scholarly inquiry for centuries - - by the beginning of the 13th century , its colleges had begun to attract resident scholars from across the European continent . Real estate professionals are tied to the development of our society in a very direct way and participate in decisions that will shape the way we live for centuries . Its catalytic domain ( AC ) presents an original , modular structure , made of two complementary fragments ( T25 and T18 ) that are both required for enzymatic activity . The Nibelungen Museum at Worms supports the mechanisms that have created and produced the myth through the centuries , and it regenerates them again and again .