Search our collection of background (non-event) articles from news media, science journals and other sources.
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2 | 1 | 9 | 13 | 8 | 3 | 5 | 1 | 1 | 1 | 1 |
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SPRING | 16 | |
SUMMER | 3 | |
WINTER | 1 |
United States | 16 | |
China | 2 | |
Norway | 2 | |
French Polynesia | 1 | |
Poland | 1 | |
Switzerland | 1 | |
Uzbekistan | 1 |