People visit 'Mushroom 2020' exhibition at Latvian Museum of Natural History
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People visit the "Mushroom 2020" exhibition at Latvian Museum of Natural History in Riga, Latvia, Sept. 9, 2020. (Photo by Edijs Palens/Xinhua)

Mushrooms are on display during the "Mushroom 2020" exhibition at Latvian Museum of Natural History in Riga, Latvia, Sept. 9, 2020. (Photo by Edijs Palens/Xinhua)

People visit the "Mushroom 2020" exhibition at Latvian Museum of Natural History in Riga, Latvia, Sept. 9, 2020. (Photo by Edijs Palens/Xinhua)

People visit the "Mushroom 2020" exhibition at Latvian Museum of Natural History in Riga, Latvia, Sept. 9, 2020. (Photo by Edijs Palens/Xinhua)

Mushrooms are on display during the "Mushroom 2020" exhibition at Latvian Museum of Natural History in Riga, Latvia, Sept. 9, 2020. (Photo by Edijs Palens/Xinhua)

Mushrooms are on display during the "Mushroom 2020" exhibition at Latvian Museum of Natural History in Riga, Latvia, Sept. 9, 2020. (Photo by Edijs Palens/Xinhua)

People visit the "Mushroom 2020" exhibition at Latvian Museum of Natural History in Riga, Latvia, Sept. 9, 2020. (Photo by Edijs Palens/Xinhua)