Search our collection of background (non-event) articles from news media, science journals and other sources.
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5 | 1 | 5 | 5 | 7 | 7 | 11 | 11 | 7 | 6 | 6 | 5 |
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SUMMER | 16 | |
FALL | 5 | |
SPRING | 4 | |
WINTER | 3 |
United States | 39 | |
Canada | 5 | |
Norway | 3 | |
Iceland | 2 | |
China | 1 | |
French Polynesia | 1 | |
Ireland | 1 | |
Poland | 1 | |
Russia | 1 | |
Sweden | 1 |