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These paperclips, when placed on the floor of a japanese commuter train, stand up on their ends and dance whenever the train accelerates or brakes thanks electromagnetism.
The video - shot on the Rokko Liner in Kobe, Japan - shows how paperclips stand on end when the train accelerates and brakes. The magnetism, which is produced by the electric current that drives the motors located under the floor, apparently poses no harm to the human body, though it could damage credit cards, mobile phones, or other electronic devices if left on the floor.
This article discusses the current state of knowledge about the deleterious health effects arising from exposure of people, particularly children, to very low frequency electromagnetic fields. References are given to epidemiological studies bearing on cancer in people, and on laboratory studies on animals indicating stress-related effects on the immune system and on embryological development.