China’s new restrictions on exports of the metals could have an impact on the production of everything from LED lights to ...

Bar magnets and horseshoe magnets are two of the most common shapes of magnet. The magnetic field is shown by lines with arrows that point from north to south. You can tell how old some coins are ...

Optical media also come in different types: Solid state devices require little power, making them ideal for portable devices where battery life is a big consideration. They are also portable due ...