Search our collection of background (non-event) articles from news media, science journals and other sources.
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35 | ||
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31 | 4 |
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2 | 5 | 3 | 7 | 5 | 1 | 4 | 1 | 3 | 4 |
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SPRING | 8 | |
WINTER | 7 | |
SUMMER | 3 | |
FALL | 1 |
United States | 7 | |
China | 2 | |
Norway | 2 | |
Canada | 1 | |
Poland | 1 | |
United Kingdom | 1 |