Search our collection of background (non-event) articles from news media, science journals and other sources.
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4 | 10 | 51 | 24 |
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14 | 5 | 8 | 13 | 13 | 1 | 8 | 6 | 5 | 4 | 6 | 6 |
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SPRING | 15 | |
WINTER | 13 | |
SUMMER | 11 | |
FALL | 8 |
United States | 42 | |
Canada | 6 | |
Norway | 3 | |
Russia | 1 | |
Sweden | 1 |