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    All over the world, libraries have begun the huge task of making faithful digital copies of the books, images and recordings that preserve the intellectual effort of mankind. For scholars, the work promises to bring such a wealth of information to desktop (that the present Internet may not match.
    Librarians see three clear benefits to going digital. First, it helps them preserve rare and fragile objects without refusing the demands of those who wish to study them. The British Library, for example, holds the only medieval （中世纪的） manuscript （手稿） of Beowulf贝奥武夫(有记载的最早一部英国文学作品) in London. Only qualified scholars were allowed to see it until Kevin S. Kiernan of the University of Kentucky scanned the manuscript with three different light sources and put the images up on the Internet for anyone to use.
    A second benefit is convenience. Once books are changed to digital form, readers can find them in seconds rather than minutes. Several people can read the same book or view the same picture at the same time. Clerks are spared the chores of  re-shelving books. And libraries could use the Internet to lend their collections to those who are unable to visit in person.