French teaching unions call a nationwide strike as a record heatwave forces 3,500 school closures and widespread schedule changes.The FSU, SE-Unsa, FNEC FP FO, CFDT and CGT cite fainting incidents, surging infirmary visits and a spike in workplace safety complaints.Most schools lack air conditioning; classrooms reach 32C to 40C, and about 10,000 schools shorten hours while exams for 850K students proceed with morning-only schedules, spaced desks and cooling breaks.Education Minister Édouard Geffray defends continuing exams and Île-de-
France allocates €1M for cooling at exam centers, while unions demand an overhaul of school infrastructure and exam timing.