As anyone can edit almost any article, it is of course possible for biased, out of date, or incorrect information to be posted to Wikipedia, especially on April Fools' Day. However, because there are so many other people reading the articles and monitoring contributions using the Recent Changes page, incorrect information is usually corrected quickly. Thus, the overall accuracy of the encyclopedia is improving all the time as it attracts more and more contributors. You are encouraged to help by correcting articles, validating content, and providing useful references.
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