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Science.gov is an interagency initiative of 17 U.S. government science organizations within 12 Federal agencies. These agencies form the voluntaryScience.gov Alliance. Visitors to the site can search across Alliance agency resources via one query.
Each agency selects its best science information for science.gov. Two major types of information are included — selected authoritative science Web sites and often hard-to-access scientific databases (specific content varies by database). This gateway to government science information allows searches across 30 databases and more than 1,700 science Web sites. Science.gov currently accesses over 47 million pages of government science information.
Science.gov allows users to search the surface Web as well as the deep Web, where traditional search engines cannot go. The information is free, with no registration required.