Search our collection of background (non-event) articles from news media, science journals and other sources.
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| SUMMER | 16 | |
| FALL | 14 | |
| SPRING | 11 | |
| WINTER | 9 |
| United States | 18 | |
| Canada | 8 | |
| Ukraine | 2 | |
| Afghanistan | 1 | |
| Australia | 1 | |
| Brazil | 1 | |
| Denmark | 1 | |
| Finland | 1 | |
| Guatemala | 1 | |
| Italy | 1 | |
| Norway | 1 | |
| Pakistan | 1 | |
| Russia | 1 | |
| Spain | 1 | |
| Sweden | 1 | |
| United Kingdom | 1 |
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