From the 1st century to today, you could say the magnet is one component of technology that has stuck around.
With that bad pun out of the way (two if you count the headline), a Hong Kong company is using the simple magnet to make the charging of our smartphones easier and faster. The MagCable is a USB cable with a magnetic end that snaps into place thanks to an adapter tip that plugs into your charging port.
There is even a Lightning magnet adapter for iPhone and charging can be sped up by a button on the cable that shuts off data sync.