14. A computer system including one or more processors and one or more computer storage media, the computer system comprising: a document analyzer that analyzes documents and identifies entities and relationships among entities in text of the documents, wherein the document analyzer also identifies assertions based on the entities and relationships identified from the text of the documents; a question generator that inverts the assertions to generate a plurality of questions that may be answered by the assertions; and a concept/topic engine that identifies concepts and/or topics associated with the plurality of questions and clusters questions around the concepts and/or topics.
14. A computer system including one or more processors and one or more computer storage media, the computer system comprising: a document analyzer that analyzes documents and identifies entities and relationships among entities in text of the documents, wherein the document analyzer also identifies assertions based on the entities and relationships identified from the text of the documents; a question generator that inverts the assertions to generate a plurality of questions that may be answered by the assertions; and a concept/topic engine that identifies concepts and/or topics associated with the plurality of questions and clusters questions around the concepts and/or topics. 16. The computer system of claim 14 , wherein the question generator inverts the assertions to generate the plurality of questions by using rule-based transformations to invert the plurality of assertions to generate the plurality of questions, wherein the rule-based transformations are based on a plurality of rules that dictate a type of question based on a type of entity of an assertion.