Search our collection of background (non-event) articles from news media, science journals and other sources.
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1 | 1 | 5 | 7 | 2 | 5 | 1 | 1 | 1 | 1 |
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SPRING | 5 | |
SUMMER | 3 | |
WINTER | 1 |
United States | 8 | |
China | 1 | |
French Polynesia | 1 | |
Norway | 1 | |
Poland | 1 |