written by Robert Mařík and Miroslava Tihlaříková

Offline version is also available and translators are welcomed .

The project Mathematical Assistant on Web is hosted on sourceforge.net and supported by Grant 99/2008 of FRVŠ.
Rattlebacks, wooden solids with surprising behavior in rotatoin. A puzzle from physics.

The rest of the Youtube chanel.

**Warning**. Did you try the problem by yourself first? Blind rewriting problem to computer and puting down the answer may have serious negative influence on your education. The optimal way how to use this application is to solve the problem and then check your result against computer generated answer.