12. The system of claim 7 , where the score for the source is further based on a value representing international diversity of the source.
7. A system comprising: one or more server devices to: receive a search query; obtain, for the search query, articles and respective scores; identify, using one or more processors, for an article, a source with which the score is associated; determine, using one or more processors, a score for the source, the score being based on polling one or more users to request the one or more users to provide a metric that represents an evaluation of a source and based on a length of time between an occurrence of an event and publication, by the source, of another article associated with the event; and adjust, using one or more processors, the score of the article based on the score for the source.