Search our collection of background (non-event) articles from news media, science journals and other sources.
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7 | 96 | 21 |
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12 | 8 | 16 | 14 | 14 | 7 | 12 | 12 | 9 | 8 | 7 | 5 |
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SPRING | 20 | |
SUMMER | 17 | |
WINTER | 17 | |
FALL | 8 |
United States | 64 | |
Canada | 7 | |
Norway | 4 | |
Iceland | 3 | |
China | 1 | |
French Polynesia | 1 | |
Ireland | 1 | |
Poland | 1 | |
Russia | 1 | |
Sweden | 1 |