Search our collection of background (non-event) articles from news media, science journals and other sources.
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17 | ||
11 | ||
9 | ||
8 | ||
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5 | ||
5 | ||
2 | ||
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1 |
67 | ||
47 | ||
33 | ||
25 | ||
19 | ||
8 | ||
5 | ||
4 | ||
3 | ||
2 | ||
1 | ||
1 | ||
1 | ||
1 | ||
1 | ||
1 | ||
1 |
4 | 42 | 21 |
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11 | 4 | 9 | 8 | 8 | 8 | 1 | 4 | 2 | 4 | 3 | 5 |
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WINTER | 12 | |
SPRING | 10 | |
SUMMER | 6 | |
FALL | 1 |
United States | 36 | |
Canada | 3 |