Search our collection of background (non-event) articles from news media, science journals and other sources.
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39 | ||
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18 | 12 | 45 | 12 |
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10 | 8 | 13 | 11 | 7 | 6 | 6 | 3 | 6 | 6 | 4 | 7 |
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WINTER | 18 | |
SPRING | 14 | |
SUMMER | 9 | |
FALL | 8 |
United States | 38 | |
Canada | 5 | |
Finland | 2 | |
Iceland | 2 | |
Norway | 2 | |
Russia | 1 |