Stock Photo - 10 December 2019, Baden-Wuerttemberg, Stuttgart: In a primary school, children work on an estimation task in which they have to estimate the number of matches in a glass. Photo: Sebastian Gollnow/dpa. - Stuttgart/Baden-Wuerttemberg/Germany

Stock Photo: 10 December 2019, Baden-Wuerttemberg, Stuttgart: In a primary school, children work on an estimation task in which they have to estimate the number of matches.

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