Stock Photo - 20 November 2018, Lower Saxony, Hannover: Speaker trainer Jan Appel speaks with journalists during a press conference. The Ministry of Education of Lower Saxony has presented a prevention campaign for schools to avoid health problems caused by noise pollution. Photo: Hauke-Christian Dittrich/dpa. - Hannover/Lower Saxony/Germany

Stock Photo: 20 November 2018, Lower Saxony, Hannover: Speaker trainer Jan Appel speaks with journalists during a press conference. The Ministry of Education of Lower Saxony.

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