Search our collection of background (non-event) articles from news media, science journals and other sources.
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| SUMMER | 21 | |
| FALL | 13 | |
| SPRING | 10 | |
| WINTER | 9 |
| United States | 29 | |
| Canada | 9 | |
| Mexico | 3 | |
| Australia | 1 | |
| Czech Republic | 1 | |
| Finland | 1 | |
| Nigeria | 1 |
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