E.D. Hirsch Jr., a former professor of humanities and education at the University of Virgina, is founder of the Core Knowledge Foundation. Here he offers a litmus test for education policy designed to help the middle class and improve economic and social mobility- does it help 12th graders make a large increase in their vocabularies? He introduces the idea of vocabulary inequality that takes away a whole world of reading and the imagination from young people. Most important is systematic knowledge building by exposing children to more and better content in non fiction literature. Content-indifferent approaches which ignore this are the wrong approach. Reading and content which expands knowledge and brings new horizons go together, in a gradual cumulative process as young people read more content.