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Children take part in Bay Area Science Festival Discover Day in San Francisco

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Children take part in the Bay Area Science Festival Discover Day at Oracle Park in San Francisco, the United States, April 24, 2022. (Photo by Liu Yilin/Xinhua)

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People take part in the Bay Area Science Festival Discover Day at Oracle Park in San Francisco, the United States, April 24, 2022. (Photo by Liu Yilin/Xinhua)