Search our collection of background (non-event) articles from news media, science journals and other sources.
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| SPRING | 15 | |
| SUMMER | 15 | |
| FALL | 8 | |
| WINTER | 5 |
| United States | 22 | |
| Canada | 6 | |
| Russia | 3 | |
| Denmark | 2 | |
| Norway | 2 | |
| Brazil | 1 | |
| China | 1 | |
| Poland | 1 | |
| Sweden | 1 | |
| Trinidad and Tobago | 1 |
Observations From Members