Search our collection of background (non-event) articles from news media, science journals and other sources.
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3 | 3 | 1 | 1 | 2 | 12 | 2 | 2 | 2 | 2 | 3 |
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SUMMER | 10 | |
WINTER | 2 |
United States | 12 | |
Canada | 6 | |
Russia | 2 |