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In the mythology of the United States and many other Western cultures, a ghost or spirit is a dead
person who interacts with the living world.
In stories, a ghost may whisper or groan, cause things to move or fall, mess with electronics - even
appear as a shadowy, blurry or see-through figure.
On ghost-hunting TV shows, people use scientific equipment to attempt to record or measure spirit
activity, and numerous creepy photos and videos make it seem like ghosts exist.
What scientists have discovered, though, are lots of reasons why people might feel they have had
ghostly encounters.