Do you know why it is raining? And how electricity is produced? Or how the sound flies? Our ancestors believed that all these phenomena were done by the powerful gods. Gradually in time, people started explaining the strange things with the help of the science. Today, you Can understand all that through a game. In the National Polytechnic Museum in Sofia (Bulgaria), there is such a special spot, called demonstration office. There you will see, touch and understand many things from the surrounding world. You can test some of the oldest devices, left by our ancestors 100 years ago. Why don’t you try to construct your own strange machine?