Eternal Engine, or How to Learn to Save Energy?

What is energy? Where does it come from and where does it go? How does it change and move? Why save it and how does it help people? Renowned poet Andrey Usachev answers these and other very important questions with poems, and the wonderful artist Uncle Kolya Vorontsov does so with drawings! We are sure that attending school lessons will now be more interesting. For younger and middle school age.