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All information, whether in print or by byte, needs to be evaluated by readers for authority, appropriateness, and other personal criteria for value. If you find information that is "too good to be true", it probably is. Never use information that you cannot verify. Establishing and learning criteria to filter information you find on the Internet is a good beginning for becoming a critical consumer of information in all forms. "Cast a cold eye" (as Yeats wrote) on everything you read. Question it. Look for other sources that can authenticate or corroborate what you find. Learn to be skeptical and then learn to trust your instincts.
— from Evaluating Information from Johns Hopkins University's research tools.