Search our collection of background (non-event) articles from news media, science journals and other sources.
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21 | ||
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49 | ||
33 | ||
32 | ||
14 | ||
11 | ||
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2 | 26 | 62 | 33 |
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21 | 9 | 11 | 12 | 14 | 14 | 2 | 7 | 10 | 9 | 9 | 5 |
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WINTER | 21 | |
SUMMER | 15 | |
SPRING | 13 | |
FALL | 9 |
United States | 67 | |
Canada | 7 | |
Russia | 3 |