Search our collection of background (non-event) articles from news media, science journals and other sources.
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5 | 9 |
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1 | 1 | 1 | 3 | 3 | 1 | 3 | 1 |
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FALL | 2 | |
SUMMER | 1 | |
WINTER | 1 |
United States | 8 | |
Canada | 1 | |
Russia | 1 |