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Nature 438, 900-901 (15 December 2005) | doi:10.1038/438900a; Published online 14 December 2005

Open Innovation Challenges

Special Report Internet encyclopaedias go head to head

Jim Giles

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Jimmy Wales' Wikipedia comes close to Britannica in terms of the accuracy of its science entries, a Nature investigation finds.

UPDATE: see details of how the data were collected for this article in the supplementary information.

UPDATE 2 (28 March 2006). The results reported in this news story and their interpretation have been disputed by Encyclopaedia Britannica. Nature responded to these objections .

One of the extraordinary stories of the Internet age is that of Wikipedia, a free online encyclopaedia that anyone can edit. This radical and rapidly growing publication, which includes close to 4 million entries, is now a much-used resource.