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Wikipedia is a free, online encyclopedia that contains articles about nearly any topic. It may be tempting to use it as a resource for an assignment, but keep in mind that most instructors WILL NOT accept wikipedia as an acceptable source.
Why? Wikipedia entries can be edited by anyone that has access to a computer and creates a wikipedia account. This often compromises the quality of information that may appear in Wikipedia entries. The last thing you want to do is to use false information in your assignments.