Bypass surgery treats symptoms of coronary heart disease. That happens when a waxy substance called plaque builds up inside the arteries in your heart and blocks blood and oxygen from reaching it. You may feel things like:
85% of the approximate 8.7m population of Bulgaria speak the official language, Bulgarian. 2.5% speak Macedonian, considered in Bulgaria as a dialect of Bulgarian and not as a separate language. Other minority languages include Romani, Turkish, spoken by 9% of the population, and the related languages of Gagauz, Tatar, and Albanian.
These days 95% of Bulgarian children don't learn any russian language at all. Most young Bulgarian people do not speak any russian (unless they go to schools that specialize in russian language which is very rare these days). In modern Bulgaria most young people learn English, German or French.