Search our collection of background (non-event) articles from news media, science journals and other sources.
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48 | ||
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30 | ||
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9 | 63 | 33 |
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18 | 6 | 9 | 10 | 13 | 8 | 2 | 8 | 10 | 9 | 9 | 3 |
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WINTER | 13 | |
SPRING | 12 | |
SUMMER | 10 | |
FALL | 9 |
United States | 54 | |
Canada | 6 | |
Russia | 3 |