Search our collection of background (non-event) articles from news media, science journals and other sources.
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49 | 28 |
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14 | 3 | 11 | 14 | 11 | 8 | 1 | 4 | 2 | 3 | 4 | 2 |
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SPRING | 12 | |
WINTER | 6 | |
SUMMER | 5 | |
FALL | 2 |
United States | 39 | |
Canada | 4 | |
Norway | 2 | |
Russia | 1 |