Search our collection of background (non-event) articles from news media, science journals and other sources.
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| 3 | 1 | 7 | 9 | 5 | 5 | 4 | 2 | 2 | 6 | 1 |
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| SPRING | 9 | |
| SUMMER | 7 | |
| FALL | 4 | |
| WINTER | 3 |
| United States | 25 | |
| Russia | 1 |
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