Psychologists from England believe they have found a reason why people believe they see or feel the presence of ghosts. They studied the reaction of hundreds of volunteers at two famous "haunted" houses in England.
The study showed a link between magnetic fields and ghostly experiences. Hampton Court Palace in Surry has high magnetic fields where sightings have occurred, as does South Bridge Vaults in Edinburgh.
Dr Paul Stevens said: "The correlations between ghostly activity and magnetic variance were relatively large and tie in with laboratory findings that suggest varying magnetic fields have a measurable effect on human physiology."