The summer 2025 flight schedules of Varna and Bourgas airports on Bulgaria’s Black Sea coast were announced on March 26 by concession-holder Fraport Twin Star Management. At Varna Airport, ...

Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www ...

Tests of Bulgaria’s civil defence siren and voice announcement system and of the BG-Alert system, which sends warnings to ...