Deep Web: Google Can't Grasp It, Other Technologies Arriving

Deep Web: Google Can't Grasp It, Other Technologies Arriving

One day last summer, Google's search engine trundled quietly past a milestone. It added the one trillionth address to the list of Web pages it knows about. But as impossibly big as that number may seem, it represents only a fraction of the entire Web.

Beyond those trillion pages lies an even vaster Web of hidden data: financial information, shopping catalogs, flight schedules, medical research and all kinds of other material stored in databases that remain largely invisible to search engines.

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