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Photo taken on May 17, 2019 shows ancient stone tools displayed at the Lusaka National Museum in Lusaka, Zambia. May 18 marks the International Museum Day. (Xinhua/Peng Lijun)
Photo taken on May 17, 2019 shows ancient stone tools displayed at the Lusaka National Museum in Lusaka, Zambia. May 18 marks the International Museum Day. (Xinhua/Peng Lijun)