In our fourth grade school there was a very undisciplined but courageous boy. When we were studying in the second shift in the evening of the winter, waiting with fear for the dictatorship of the fourth lesson of Russian, he proposed: "Well, now the lights in the whole school will turn off, and we will go home! “Of course we agreed.

Then he pulled out three nails from his pocket, placed two of them in the rosette with a plate, and threw a third on them from the top. The lights went off and we were released home.

So I realized that electricity is a great force.