Electromagnetism leaking through the floor of a Kobe train causes paperclips to dance. (Watch video.)
The video -- shot on the Rokko Liner in Kobe, Japan -- shows how paperclips on the floor react when the train accelerates and decelerates. The magnetic pull, 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. The Kobe New Transit Company, which operates the Rokko Liner (as well as the Port Liner, which uses similar trains), says extra shielding is being installed for good measure.