The Tetherless World Constellation project at RPI mines open government datasets using semantic web technologies. So far, they have developed 45 demos, one of them showing library books per inhabitants of each state in the U.S. Other questions you may have and they provide answers for include who visits the White House most frequently, how do smoking quit rates, state by state, relate to unemployment, taxes, and violent of crimes, and the relations between the biography of U.S. Supreme Court justices and their decisions.