Search our collection of background (non-event) articles from news media, science journals and other sources.
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20 | 48 | 14 |
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11 | 11 | 8 | 6 | 1 | 5 | 2 | 2 | 3 | 12 | 7 | 14 |
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WINTER | 11 | |
FALL | 2 | |
SPRING | 2 | |
SUMMER | 2 |
United States | 29 | |
Norway | 3 | |
Canada | 1 | |
Russia | 1 |