Search our collection of background (non-event) articles from news media, science journals and other sources.
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| SPRING | 20 | |
| SUMMER | 18 | |
| WINTER | 17 | |
| FALL | 5 |
| United States | 63 | |
| Canada | 8 | |
| Norway | 4 | |
| Iceland | 3 | |
| China | 1 | |
| French Polynesia | 1 | |
| Ireland | 1 | |
| Poland | 1 | |
| Russia | 1 | |
| Sweden | 1 |
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