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As rival to Wikipedia,Google has unveiled "Knol" the new encyclopedia.

Google has invented the word 'knol' an abbreviation of 'knowledge' to describe each of the articles which it intends to be written for free by 'millions' of experts and published on the site.

Unlike Wikipedia, knol requires the authors to identify themselves to help the audience assess the source's credibility.Google doesn't intend to screen the submissions for accuracy,and instead will rely on its search formulas to highlight the articles that readers believe are credible.