Ghosts, Poltergeists, and Haunted Houses

Ghosts . . . are they real spirits or just the stuff of scary stories? Scientists have yet to find any evidence spirits of the dead exist in our world, yet many people believe they do. Whatever our opinions, legends of ghosts, poltergeists, and hauntings exist in many cultures. At times helpful, at times terrifying, ghosts have a fearful grip on our imaginations.