The city has a high concentration of research institutions, which are independent or loosely connected with the universities. Among them are three national science centres: Kharkiv Institute of Physics and Technology, Institute of Meteorology, Institute for Experimental and Clinical Veterinary Medicine and 20 national research institutions of the National Academy of Science of Ukraine, such as the B Verkin Institute for Low Temperature Physics and Engineering, Institute for Problems of Cryobiology and Cryomedicine, State Scientific Institution "Institute for Single Crystals", Usikov Institute of Radiophysics and Electronics (IRE), Institute of Radio Astronomy (IRA), and others. A total number of 26,000 scientists are working in research and development.