10. The system of claim 8 , wherein a selected resource for a given question is a resource that has received at least one selection in response to a user submitting the given question as a search query to the search engine, and wherein a selection received by the resource is a selection by the user of a search result identifying the resource.
10. The system of claim 8 , wherein a selected resource for a given question is a resource that has received at least one selection in response to a user submitting the given question as a search query to the search engine, and wherein a selection received by the resource is a selection by the user of a search result identifying the resource. 11. The system of claim 10 , wherein identifying selected resources comprises, for each of the plurality of questions: identifying selected resources that have received more than a second threshold number of selections.