Search our collection of background (non-event) articles from news media, science journals and other sources.
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44 | 37 |
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6 | 4 | 4 | 7 | 5 | 6 | 15 | 8 | 4 | 10 | 4 | 8 |
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SUMMER | 14 | |
FALL | 3 | |
WINTER | 2 | |
SPRING | 1 |
United States | 40 | |
Canada | 7 | |
Iceland | 1 | |
Russia | 1 |