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Viewers watch a light projection showed on the facade of the Hungarian Science Academy as a side event of the World Science Forum in Budapest, Hungary on Nov. 21, 2019. (Photo by Attila Volgyi/Xinhua)
Viewers watch a light projection showed on the facade of the Hungarian Science Academy as a side event of the World Science Forum in Budapest, Hungary on Nov. 21, 2019. (Photo by Attila Volgyi/Xinhua)