20 November 2020, Berlin: Chairs are placed high in a classroom of the primary school in the K?llnische Heide. During the Corona crisis, school operations are facing great challenges. Behavioural measures, hygiene and protection measures, ventilation, wearing of mouth and nose protectors and repeated quarantine cases up to school closures have to be mastered. (to "Berlin GEW demands a quick end to regular lessons") Photo: Britta Pedersen/dpa-Zentralbild/dpa