Search our collection of background (non-event) articles from news media, science journals and other sources.
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2 |
14 | ||
14 | ||
10 | ||
10 | ||
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1 |
22 | 19 | 3 |
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SPRING | 4 | |
SUMMER | 1 |
United States | 14 | |
Canada | 3 | |
Russia | 2 | |
China | 1 |