Some of the more valuable examples are so well preserved you can still see the original bright red-copper color. These coins ...

The oxygen in our air slowly reacts with the alloys in copper to layer on a green coating called a patina. One of the most famous examples of copper’s corrosion is the Statue of Liberty ...

She explains that while the microchips the company uses contain rare earth minerals, around 90% of a finished circuit board is copper. Take LEDs, for example: while the rare earth element terbium ...

If you compare a modern PCB with a typical 1980s PCB, you might notice — like [lcamtuf] did — that newer boards tend to have large areas of copper known as pours instead of empty space between ...