Search our collection of background (non-event) articles from news media, science journals and other sources.
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1 | 1 | 4 | 11 | 4 | 1 | 11 | 42 | 21 |
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12 | 8 | 10 | 9 | 10 | 11 | 3 | 8 | 3 | 6 | 9 | 7 |
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WINTER | 19 | |
SUMMER | 15 | |
SPRING | 14 | |
FALL | 8 |
United States | 49 | |
Canada | 6 | |
Norway | 2 | |
Ukraine | 2 | |
Afghanistan | 1 | |
Australia | 1 | |
Guatemala | 1 | |
Russia | 1 | |
Sweden | 1 |