Does the Bible tell us whether Satan and demons can make themselves visible to the human eye? Can they materialize and appear as humans, without being recognized as spirit beings? Should you try to contact aliens or the ghosts of deceived loved ones? How can you protect yourself against Satan and his fallen angels? What kind of activities are we to avoid at all costs? Should we stay away from demonic movies and video games, séances, Ouija boards, far-eastern meditation practices, haunted houses, chiropractors who use the Reiki method, and medical hypnosis?