Search our collection of background (non-event) articles from news media, science journals and other sources.
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19 | 11 | 46 | 16 |
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11 | 6 | 10 | 13 | 5 | 19 | 4 | 3 | 5 | 2 | 10 | 4 |
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WINTER | 19 | |
SUMMER | 18 | |
SPRING | 15 | |
FALL | 5 |
United States | 32 | |
Canada | 8 | |
Norway | 2 | |
Russia | 2 | |
Spain | 1 | |
Vietnam | 1 |