Search our collection of background (non-event) articles from news media, science journals and other sources.
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7 | 19 | 96 | 21 |
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14 | 9 | 17 | 17 | 15 | 11 | 12 | 12 | 11 | 9 | 9 | 7 |
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WINTER | 22 | |
SPRING | 21 | |
SUMMER | 20 | |
FALL | 13 |
United States | 74 | |
Canada | 8 | |
Norway | 5 | |
Iceland | 3 | |
Russia | 2 | |
China | 1 | |
French Polynesia | 1 | |
Ireland | 1 | |
Poland | 1 | |
Sweden | 1 |