Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for using scientific papers in web search are described. A web search system can rank scientific content highly in search results of a query, when the scientific content has been popular in the past but is obscure at query time. The web search system can augment a search query by providing additional search terms when terms in the search query and the additional search terms appeared together in news stories frequently in the past but appear together infrequently at query time.
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