Search our collection of background (non-event) articles from news media, science journals and other sources.
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20 | 19 | 96 | 24 |
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16 | 10 | 20 | 21 | 16 | 15 | 13 | 12 | 11 | 9 | 9 | 7 |
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SPRING | 28 | |
WINTER | 25 | |
SUMMER | 23 | |
FALL | 13 |
United States | 82 | |
Canada | 10 | |
Norway | 5 | |
Iceland | 4 | |
Russia | 2 | |
China | 1 | |
French Polynesia | 1 | |
Ireland | 1 | |
Poland | 1 | |
Sweden | 1 |