6. The method of claim 1 , wherein selecting the set of knowledge modules to be presented in a knowledge panel for the entity comprises: ranking content categories for the content items based on rank scores for the content items that have been classified to the content categories; and selecting a knowledge module for each of the content categories that is included in a highest ranking subset of the content categories.
6. The method of claim 1 , wherein selecting the set of knowledge modules to be presented in a knowledge panel for the entity comprises: ranking content categories for the content items based on rank scores for the content items that have been classified to the content categories; and selecting a knowledge module for each of the content categories that is included in a highest ranking subset of the content categories. 9. The method of claim 6 , further comprising: selecting, for inclusion in the set of knowledge modules, a related search module; and populating the related search module with related search content items, each of the related search content items being content items that initiate a new search in response to user interaction with the related search content item.