If your new charger is half the size of your old one but charges your laptop faster, you can thank a material called gallium nitride, or GaN. Silicon versus GaN For decades, chargers were built with s...

Active noise cancelling (ANC) feels a little like magic: you press a button and the hum of a plane, a train or an open-plan office simply fades away. Here is what is really happening inside your headp...