Search our collection of background (non-event) articles from news media, science journals and other sources.
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9 | 11 | 46 | 16 |
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8 | 4 | 9 | 11 | 3 | 19 | 4 | 3 | 5 | 2 | 10 | 4 |
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SUMMER | 18 | |
WINTER | 14 | |
SPRING | 10 | |
FALL | 5 |
United States | 30 | |
Canada | 6 | |
Norway | 2 | |
Russia | 2 | |
Spain | 1 |