Search our collection of background (non-event) articles from news media, science journals and other sources.
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| SUMMER | 26 | |
| SPRING | 10 | |
| WINTER | 8 | |
| FALL | 6 |
| United States | 20 | |
| Canada | 19 | |
| Sweden | 3 | |
| Russia | 2 | |
| Finland | 1 | |
| Greece | 1 | |
| Norway | 1 | |
| Spain | 1 |
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