Search our collection of background (non-event) articles from news media, science journals and other sources.
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| SPRING | 5 | |
| SUMMER | 4 | |
| WINTER | 4 | |
| FALL | 1 |
| United States | 14 | |
| Norway | 3 | |
| Iceland | 1 | |
| Spain | 1 |
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