Search our collection of background (non-event) articles from news media, science journals and other sources.
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35 | ||
19 | ||
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19 | 16 |
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1 | 3 | 4 | 6 | 11 | 3 | 2 | 1 | 4 |
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SUMMER | 6 | |
SPRING | 3 | |
FALL | 2 |
United States | 18 | |
Russia | 2 | |
Canada | 1 |