Public music schools exist for the primary and secondary level in addition to public special education classes or schools. Students who attend music schools are still obliged to follow the regular program in their primary and secondary schools. The classes are usually held in the opposite shift of their regular school hours.
There are over thirty scientific institutes, including the Energy Institute "Hrvoje Požar" in Zagreb, the Civil Engineering Institute of Croatia, the Cultural and Scientific Center "Milutin Milanković", and the Institute "Ruđer Bošković" in Zagreb which is the largest in the country.
The Croatian Academy of Sciences and Arts in Zagreb is a learned society promoting language, culture, and science from its first conception in 1866. (The juxtaposition of the words typically seen in English as "Arts and Sciences" is deliberate.)