Search our collection of background (non-event) articles from news media, science journals and other sources.
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18 | ||
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11 | ||
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47 | ||
45 | ||
28 | ||
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11 | ||
8 | ||
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2 | 63 | 34 |
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18 | 6 | 9 | 10 | 13 | 9 | 2 | 5 | 8 | 8 | 8 | 3 |
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WINTER | 13 | |
SPRING | 12 | |
SUMMER | 7 | |
FALL | 6 |
United States | 48 | |
Canada | 7 | |
Russia | 3 |