People have been studying ghosts and the paranormal for many years. Television shows have even been created showing the scientific instruments that have been used to prove that ghosts do exist in certain areas of the world and in certain buildings. Early on, ghost hunters would use tape recorders and clear the haunted house or building of all things that could make noise. Then they would set up the tape recorder to record any sounds when nobody was there. They would listen to the recording the next day.
Scientifically, ghost hunters would use electromagnetic fields and infrasound and the tools used to detect them in a haunted area. Using these devices, the ghost hunters could determine if something was in this area that was not human.
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