The Encyclopedia of Ghosts and SpiritsBook - 2000 | 2nd ed.
The second edition features recent break-throughs and incidents, new information about important myths, and the increase in scientifically conducted studies; new and updated entries on prominent people in the field; new entries on Japanese ghosts, ghost lore, and ghost history; and expanded international coverage.
-- Gremlins: Small, pesky spirits that first appeared in British military aircraft during World War II
-- Poltergeists: The repressed emotions of adolescents may somehow activate these paranormal forces
-- Ghostbusters: The real-life researchers into the paranormal and their investigative techniques.