Search our collection of background (non-event) articles from news media, science journals and other sources.
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6 | 5 | 5 | 6 | 1 | 5 | 2 | 4 | 9 | 7 | 3 | 7 |
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FALL | 4 | |
SUMMER | 3 | |
WINTER | 3 |
United States | 23 | |
Norway | 1 | |
Russia | 1 |