Search our collection of background (non-event) articles from news media, science journals and other sources.
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3 | ||
3 | ||
2 |
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13 | ||
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9 | ||
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1 | ||
1 |
22 | 20 | 12 |
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SPRING | 4 | |
SUMMER | 3 |
United States | 18 | |
Canada | 4 | |
Russia | 2 | |
China | 1 |