We trust them when we need a general idea of how something works, a quick explanation, or instant information on odd things that we may not be confident enough asking in class or in a casual conversation. We trust Wikipedia because it never has been totally wrong. The thing here is that the site is run by so many different folks who care very deeply about the subjects that they are publishing and releasing to the public that they wouldn't dare allow any false information taint that admiration they have for it. In addition to that aren't you also gifting to yourself when you release this info and have it read by millions of people in seconds?
My point here is that although Wikipedia is a resource designed for quick information, it is still more than reliable enough thanks to egos to allow us to use this information at will and use it efficiently.
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