A diode is an electrical device that allows current to move through it in one direction with far greater ease than in the other. The first diodes were crystals used as rectifiers in home radio kits. A ...

Claimed to be the first-ever “magnetic field diode”, a device in which one wire coil can transfer its magnetic field to a second coil, but not the other way around has been created by Jordi Prat-Camps ...