Search our collection of background (non-event) articles from news media, science journals and other sources.
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12 | ||
9 | ||
5 | ||
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58 | ||
38 | ||
26 | ||
25 | ||
12 | ||
11 | ||
8 | ||
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30 | 28 |
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10 | 2 | 3 | 8 | 11 | 8 | 1 | 4 | 2 | 3 | 4 | 2 |
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SUMMER | 5 | |
SPRING | 4 | |
FALL | 2 | |
WINTER | 1 |
United States | 31 | |
Canada | 3 | |
Norway | 1 | |
Russia | 1 |