The means of communication would include pneumatic mail tubes, telephones, telegraphs, radios, and mechanically composed newspapers. -- Howard P. Segal, The Technological Utopians, in Joseph J. Corn (Ed.), Imagining Tomorrow: History, Technology and The American Future (Cambridge: MIT Press, 1986).
The magnetic interference can also cause problems with NFC performance on the new iPhones, and Apple has now started warning manufacturers in its MFi program with accessories supporting the devices to avoid magnets or metal.
A: All magnets have both a north and a south pole, which causes them to either repel or attract one another depending on how the two poles are lined up. If the north pole of one magnet meets the south pole of another, the two will be attracted, but if either both north or south poles meet, the magnets will repel one another. Keep Learning.