"Polytechnical museum is a scientific, enlightening and cultural-leisure centre of Russia, the main museum in history of science and technology. In December 1991 the Museum was declared a federal property and defined as a particularly valuable object of Russian national heritage, including the Museum itself and the Central Polytechnical Library. The Museum keeps more than 100 collections with more than 160,000 exhibits. Many of them are unique relics of science and technique. Museum's exposition occupies about 10,500 sq. m. and it is designed according to the chronological principle with the application of original historical documents and materials, relics of science and technology, working models and installations, dioramas. There are departments of Geology and Mining, Metallurgy, Chemical technology, Engineering, Automation and Computers, Automobile transport, Radioelectronics and Communication, Optics, Meteorology, Cosmonautics, Power engineering in the Museum. Visitors themselves can take part in entertaining physical experiments in the new department "Igroteka" - which is an interactive exposition."