Search our collection of background (non-event) articles from news media, science journals and other sources.
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30 | ||
21 | ||
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32 | 34 |
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11 | 3 | 3 | 6 | 7 | 4 | 2 | 5 | 8 | 8 | 8 | 1 |
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FALL | 6 | |
SUMMER | 4 | |
WINTER | 1 |
United States | 30 | |
Canada | 6 | |
Russia | 3 |