Search our collection of background (non-event) articles from news media, science journals and other sources.
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35 | ||
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1 | 2 | 20 | 8 |
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3 | 3 | 6 | 2 | 3 | 3 | 2 | 5 | 1 | 3 |
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SUMMER | 7 | |
SPRING | 6 | |
WINTER | 4 |
United States | 22 | |
Norway | 3 | |
Canada | 2 | |
Spain | 1 |