Well, often I use Wikipedia. specially for student who come to do their home work.
Wikipedia is a free internet encyclopedia that is maintained by general users. Like an encyclopedia there are an umlimited number of subjects or topics. Terms and items in the description are cross referenced to other wikipedia entries, making it extremely easy to complete research.
Since the entry and maintenance of subject material can be edited by any Internet visitor, the information should not be considered to be complete or the final answer, but is often accurate and useful for quick information.
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