Search our collection of background (non-event) articles from news media, science journals and other sources.
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| SPRING | 11 | |
| SUMMER | 7 | |
| WINTER | 4 | |
| FALL | 3 |
| United States | 15 | |
| Canada | 5 | |
| China | 1 | |
| Norway | 1 | |
| Russia | 1 |
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