Search our collection of background (non-event) articles from news media, science journals and other sources.
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19 | ||
12 | ||
10 | ||
5 | ||
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61 | ||
35 | ||
18 | ||
14 | ||
11 | ||
10 | ||
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11 | 7 | 34 | 9 |
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9 | 2 | 5 | 4 | 3 | 2 | 6 | 8 | 9 | 4 | 4 | 5 |
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SUMMER | 12 | |
WINTER | 8 | |
FALL | 7 | |
SPRING | 4 |
United States | 35 | |
Canada | 3 | |
Iceland | 2 | |
Norway | 2 | |
Russia | 2 |