Wikipedia:Tip of the day/February 22, 2007
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When and how to exclude Wikipedia from your Google search
Add -site:http://en.wikipedia.org
to your Google searches to exclude English Wikipedia articles from your search. This is useful for finding sources, or for when you are already familiar with what Wikipedia has to say about a subject, and you want to see what else there is out there. Adding -wikipedia
will exclude all Wikipedia links and mirror sites from the search.
Read more:
Using external search engines