Stock Photo - 26 October 2020, North Rhine-Westphalia, Gütersloh: At the start of school in North Rhine-Westphalia, after the autumn holidays, a female pupil sits in a class at Freiherr-vom-Stein-Realschule in Gütersloh with her winter jacket and a mouth and nose cover with the windows open. An important element in the schools' hygiene concepts for protection against corona is the intensive ventilation of the classrooms. Many students and parents fear that it could get cold in the classrooms in the coming weeks and months. Every 20 minutes, the Ministry of Education stipulates that classrooms must be ventilated. This is a measure to ensure that the aerosol concentration and thus the risk of corona does not increase too much. Photo: Guido Kirchner/dpa. - Gütersloh/North Rhine-Westphalia/Germany

Stock Photo: 26 October 2020, North Rhine-Westphalia, Gütersloh: At the start of school in North Rhine-Westphalia, after the autumn holidays.

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