Search our collection of background (non-event) articles from news media, science journals and other sources.
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31 | 13 |
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3 | 1 | 7 | 9 | 6 | 8 | 3 | 2 | 1 | 4 |
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SPRING | 9 | |
SUMMER | 6 | |
FALL | 2 | |
WINTER | 2 |
United States | 21 | |
Russia | 2 |