Search our collection of background (non-event) articles from news media, science journals and other sources.
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52 | 28 |
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6 | 5 | 5 | 6 | 6 | 19 | 3 | 5 | 9 | 7 | 3 | 6 |
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SUMMER | 15 | |
FALL | 4 | |
SPRING | 3 | |
WINTER | 3 |
United States | 32 | |
Canada | 3 | |
Norway | 2 | |
French Polynesia | 1 | |
Russia | 1 |