22 June 2020, Hessen, Frankfurt/Main: "Schule" is written on a sign at the entrance of a Frankfurt elementary school. Starting Monday, elementary school students in Hesse will be allowed to attend classes together again after months of restrictions. Photo: Boris Roessler/dpa

22 June 2020, Hessen, Frankfurt/Main: Two pupils from a primary school run the last few metres to the schoolyard with a satchel on their backs. Starting Monday, elementary school students in Hesse will again be allowed to attend classes together after months of restrictions. Photo: Boris Roessler/dpa

22 June 2020, Hessen, Frankfurt/Main: A primary schoolgirl puts on a disposable mask before entering a school compound. Starting Monday, elementary school children in Hesse will be allowed to come to school together again after months of restrictions. Wearing a mask is no longer mandatory, but is still expressly desired by many schools. Photo: Boris Roessler/dpa

22 June 2020, Hessen, Frankfurt/Main: A "entrance" provisionally sprayed on the floor marks the entrance to a school for pupils. Starting Monday, primary school children in Hesse will be allowed to attend classes together again after months of restrictions. Photo: Boris Roessler/dpa