Search our collection of background (non-event) articles from news media, science journals and other sources.
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| SUMMER | 16 | |
| SPRING | 15 | |
| WINTER | 12 | |
| FALL | 6 |
| United States | 35 | |
| Canada | 6 | |
| Norway | 4 | |
| Russia | 3 | |
| China | 1 | |
| Ireland | 1 | |
| Pakistan | 1 | |
| Spain | 1 | |
| Vietnam | 1 |
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