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Children make Christmas decorations by folding pages of old books at a university library in Bydgoszcz, Poland, on Dec. 18, 2017. (Xinhua/Jaap Arriens)
Children make Christmas decorations by folding pages of old books at a university library in Bydgoszcz, Poland, on Dec. 18, 2017. (Xinhua/Jaap Arriens)