Search our collection of background (non-event) articles from news media, science journals and other sources.
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21 | ||
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9 | ||
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118 | ||
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49 | ||
31 | ||
29 | ||
14 | ||
11 | ||
9 | ||
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2 | ||
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1 |
25 | 62 | 31 |
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20 | 9 | 11 | 12 | 14 | 12 | 2 | 7 | 10 | 9 | 9 | 3 |
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WINTER | 18 | |
SUMMER | 15 | |
SPRING | 13 | |
FALL | 9 |
United States | 64 | |
Canada | 7 | |
Russia | 3 |