Search our collection of background (non-event) articles from news media, science journals and other sources.
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52 | ||
34 | ||
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14 | ||
11 | ||
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25 | 63 | 36 |
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20 | 9 | 11 | 12 | 14 | 15 | 4 | 8 | 10 | 9 | 9 | 3 |
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WINTER | 18 | |
SUMMER | 15 | |
SPRING | 13 | |
FALL | 9 |
United States | 65 | |
Canada | 8 | |
Russia | 3 |