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Have they really solved the problems that have stumped scientists for the last 200 years, or are they just ignoring them?

Not that he seemed terribly worried - at least not at first. - "We're a content-driven, interactive, information provider" - to the executives at companies like Softbank Corp.

Although a few have continued to dream of a universal library - Vannevar Bush, who described his memex system in 1945; Ted Nelson, who has been working on Xanadu since the early 1970s - they are widely seen as laughable in our relativist, postmodern era.

But recently there have been hints of entirely new ways to classify knowledge, new systems for sorting and storing information that avoid the pitfalls of the past and can work on unimaginably large corpuses.

The most common systems in the US - the Dewey Decimal System and Library of Congress Classification - were developed during the close of the 19th century.

Unsurprisingly, they are poor at classifying knowledge in "newly" established fields like genetics or electrical engineering.

Their ordering of the Web is precise enough - and intuitive enough - that almost 800,000 people a day use Yahoo! Sites that don't make a point of notifying Yahoo!

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