Search our collection of background (non-event) articles from news media, science journals and other sources.
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12 | 3 |
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1 | 1 | 1 | 2 | 3 | 2 | 2 | 3 |
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SUMMER | 4 | |
WINTER | 1 |
United States | 7 | |
Canada | 3 | |
Sweden | 1 |