AGN powered (somehow!) by accretion onto black holes, form relativistic jets, look like blazars & quasars & radio galaxies. How formed? Structure/ energetics of jets? How energy extracted from black hole? Host galaxy and near environment: Test AGN unification. See whether/how AGN activity (BH mass, accretion rate) related to properties of host galaxy (luminosity, mass, morphology). Compare cosmic evolution of black holes and stars... Curious-er and curious-er!