Search our collection of background (non-event) articles from news media, science journals and other sources.
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27 | ||
25 | ||
17 | ||
11 | ||
10 | ||
8 | ||
8 | ||
6 | ||
5 | ||
3 | ||
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71 | ||
50 | ||
36 | ||
29 | ||
23 | ||
8 | ||
7 | ||
5 | ||
3 | ||
2 | ||
2 | ||
2 | ||
1 | ||
1 | ||
1 | ||
1 | ||
1 | ||
1 |
1 | 11 | 41 | 18 |
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11 | 5 | 9 | 8 | 8 | 7 | 1 | 4 | 2 | 5 | 6 | 5 |
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WINTER | 13 | |
SPRING | 10 | |
SUMMER | 9 | |
FALL | 4 |
United States | 38 | |
Canada | 2 |