Search our collection of background (non-event) articles from news media, science journals and other sources.
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2 | 56 | 11 |
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8 | 10 | 9 | 8 | 9 | 7 | 7 | 3 | 1 | 3 | 4 |
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WINTER | 17 | |
SPRING | 16 | |
SUMMER | 8 | |
FALL | 2 |
United States | 36 | |
Canada | 2 | |
China | 2 | |
Norway | 2 | |
Cambodia | 1 | |
French Polynesia | 1 |