Search our collection of background (non-event) articles from news media, science journals and other sources.
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| SPRING | 22 | |
| SUMMER | 20 | |
| FALL | 18 | |
| WINTER | 12 |
| United States | 33 | |
| Canada | 12 | |
| Norway | 4 | |
| Russia | 4 | |
| Afghanistan | 1 | |
| China | 1 | |
| Denmark | 1 | |
| India | 1 | |
| Iran | 1 | |
| Ireland | 1 | |
| Italy | 1 | |
| Mongolia | 1 | |
| Pakistan | 1 | |
| Spain | 1 | |
| Switzerland | 1 | |
| Ukraine | 1 |
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