For more than 716,000 Bulgarian students, today marks the official start of the new school year. Among them are around 55,000 first graders, stepping into the classroom for the very first time. September 15 has long been a day full of anticipation and emotion, not only for children but also for their parents, who prepare weeks in advance, and for adults who are inevitably reminded of their own school years. But why exactly this date? Why not September 1, as in some countries, or October 1, as