The Disk Euler's is an educational game that showcases the dynamic of a rotating disk on a flat surface, and has become the subject of much scientific research. If we take a currency in the same way, the rotation won't last long. Instead, the rotation of the Disk Euler's lasts much longer and this is mainly due to less friction because the glass surface, but the great mass of the disk. This phenomenon was studied first by the Leonard Euler in the 18th century, from where it gets its name.