Search our collection of background (non-event) articles from news media, science journals and other sources.
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4 | 8 | 27 | 9 |
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6 | 4 | 5 | 5 | 3 | 4 | 2 | 3 | 2 | 9 | 2 | 3 |
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FALL | 6 | |
SPRING | 5 | |
SUMMER | 5 | |
WINTER | 5 |
United States | 20 | |
Russia | 2 | |
Canada | 1 | |
Switzerland | 1 |