Gyroscopes are just so cool. The device in this video can be found on science websites. If you've never played with a gyroscope, it's worth buying one. Even when you see videos of them, nothing really gives you the true feel of how magical they are until you play with it yourself. Obviously gyroscopes are more than just toys, they can be found in trains, ships, airplanes, satellites etc.
I wanted to put this video out as a basic demonstration of the properties of gyroscopes. I've got another video in the works about gyroscopes coming later this year. It will be worth the wait. :)