High Energy Radiation from Black Holes: Gamma Rays, Cosmic Rays, and NeutrinosBright gamma ray flares observed from sources far beyond our Milky Way Galaxy are best explained if enormous amounts of energy are liberated by black holes. The highest energy particles in nature the ultra high energy cosmic rays cannot be confined by the Milky Way's magnetic field and must originate from sources outside our Galaxy. Understanding these energetic radiations requires an extensive theoretical framework involving the radiation physics and