Search our collection of background (non-event) articles from news media, science journals and other sources.
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41 | ||
37 | ||
24 | ||
22 | ||
8 | ||
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52 | 33 |
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11 | 3 | 9 | 10 | 13 | 8 | 2 | 4 | 8 | 8 | 8 | 1 |
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SPRING | 12 | |
SUMMER | 7 | |
FALL | 6 | |
WINTER | 1 |
United States | 40 | |
Canada | 6 | |
Russia | 3 |