Search our collection of background (non-event) articles from news media, science journals and other sources.
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3 | ||
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18 | ||
15 | ||
9 | ||
2 | ||
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22 | 4 |
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3 | 1 | 3 | 6 | 5 | 2 | 3 | 1 | 1 | 1 |
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SPRING | 6 | |
WINTER | 3 | |
SUMMER | 2 | |
FALL | 1 |
United States | 5 | |
China | 1 | |
Norway | 1 | |
Poland | 1 | |
Uzbekistan | 1 |