Search our collection of background (non-event) articles from news media, science journals and other sources.
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| FALL | 22 | |
| SUMMER | 16 | |
| WINTER | 14 | |
| SPRING | 7 |
| United States | 129 | |
| Canada | 22 | |
| Russia | 8 | |
| Iceland | 3 | |
| Norway | 3 | |
| Brazil | 1 | |
| China | 1 | |
| Ireland | 1 | |
| Italy | 1 | |
| Sweden | 1 | |
| Trinidad and Tobago | 1 | |
| United Kingdom | 1 |
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