The Poltergeist Phenomenon

The Poltergeist Phenomenon

What causes a Poltergeist??, A demonic spirit??, a restless Soul ?? or is there any truth that it could be linked to the a super charged Pineal gland embedded in the brain of children going through puberty there are even theories that it could linked to a certain type of epileptic seizures , or is it just the a simple electromagnetic anomaly due to houses being situated to close to strong power sources like power lines??, Michael Clarksons new book presents many of these theories and takes an in depth look into possible reasons for these occurrences .