Search our collection of background (non-event) articles from news media, science journals and other sources.
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7 | 45 | 14 |
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7 | 6 | 5 | 11 | 6 | 6 | 7 | 1 | 4 | 5 | 4 | 4 |
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WINTER | 10 | |
SUMMER | 8 | |
SPRING | 6 | |
FALL | 5 |
United States | 34 | |
Canada | 4 | |
Iceland | 2 | |
Finland | 1 | |
Norway | 1 |