Nickel - Periodic Table of Videos
The team at periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about nickel -- its element number 28 and a transition metal.
Meteorites contain both iron and nickel. Many years ago, these meteorites were used as a superior form of iron. Since the metal did not rust, it was regarded by the natives of Peru as a kind of silver.