Search our collection of background (non-event) articles from news media, science journals and other sources.
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21 | 17 |
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3 | 3 | 1 | 1 | 2 | 16 | 3 | 2 | 2 | 2 | 3 |
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SUMMER | 12 | |
WINTER | 2 |
United States | 14 | |
Canada | 7 | |
Russia | 2 |