Powerful magnets bring us material needs, but also harm to us, anything has two sides, you parents read this article, hope that we take care of their children, to prevent children from swallowing magnets. David Bradbury, Australia's assist…

Maglev train is a modern high-tech rail transit tool. It realizes the non-contact levitation and guidance between train and track by electromagnetic force, and then uses the electromagnetic force generated by linear motor to pull the train…