Search our collection of background (non-event) articles from news media, science journals and other sources.
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10 | ||
6 | ||
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3 | ||
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30 | ||
11 | ||
9 | ||
9 | ||
7 | ||
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5 | ||
3 | ||
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1 | ||
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23 | 7 |
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9 | 3 | 1 | 1 | 1 | 6 | 3 | 2 | 1 | 1 | 2 |
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WINTER | 14 | |
SUMMER | 8 | |
FALL | 3 | |
SPRING | 1 |
United States | 21 | |
Canada | 1 |