The term “invisible web” or “deep web” refers to the vast repository of information that search engines and directories don’t have direct access to, like databases at university libraries, sites that require passwords to view, or sites that for some reason don’t want search engines to crawl them. Unlike pages on the visible Web (that is, the Web that you can access from search engines and directories), information in databases is generally inaccessible to the software spiders and crawlers that create search engine indexes.
This cool guide/primer to get you started on how to serch the internet for actual facts, ratehr than opions crap and porn, Who know's one day you may need some facts.
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