Search our collection of background (non-event) articles from news media, science journals and other sources.
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37 | 15 |
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2 | 1 | 4 | 11 | 3 | 15 | 3 | 4 | 2 | 7 |
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SUMMER | 12 | |
SPRING | 6 | |
WINTER | 2 | |
FALL | 1 |
United States | 18 | |
Canada | 3 | |
Russia | 2 | |
Spain | 1 |