Search our collection of background (non-event) articles from news media, science journals and other sources.
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2 | 1 | 1 | 3 | 8 | 6 | 7 | 2 | 1 | 2 | 3 |
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SUMMER | 8 | |
SPRING | 6 | |
FALL | 1 | |
WINTER | 1 |
United States | 21 | |
Canada | 2 | |
China | 1 | |
French Polynesia | 1 | |
Norway | 1 |