Search our collection of background (non-event) articles from news media, science journals and other sources.
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1 | 1 | 5 | 9 | 5 | 5 | 4 | 2 |
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3 | 3 | 2 | 7 | 2 | 1 | 3 | 3 | 7 | 1 |
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FALL | 10 | |
SPRING | 10 | |
WINTER | 7 | |
SUMMER | 3 |
United States | 6 | |
Norway | 5 | |
Denmark | 2 | |
Sweden | 2 | |
Afghanistan | 1 | |
Australia | 1 | |
Canada | 1 | |
Mongolia | 1 | |
Romania | 1 | |
Saint Vincent and the Grenadines | 1 |