Search our collection of background (non-event) articles from news media, science journals and other sources.
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4 | 4 | 4 | 8 | 3 | 3 | 3 | 9 | 7 | 2 | 3 | 8 |
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WINTER | 15 | |
SPRING | 13 | |
SUMMER | 11 | |
FALL | 6 |
United States | 32 | |
Canada | 5 | |
Norway | 4 | |
Iceland | 2 | |
Russia | 2 | |
Nepal | 1 | |
Nigeria | 1 | |
Spain | 1 | |
United Kingdom | 1 |