Search our collection of background (non-event) articles from news media, science journals and other sources.
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17 | ||
10 | ||
9 | ||
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5 | ||
2 | ||
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66 | ||
45 | ||
32 | ||
25 | ||
21 | ||
8 | ||
5 | ||
4 | ||
3 | ||
2 | ||
1 | ||
1 | ||
1 | ||
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1 | ||
1 | ||
1 |
7 | 41 | 18 |
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11 | 4 | 9 | 8 | 8 | 5 | 1 | 3 | 2 | 5 | 5 | 5 |
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WINTER | 12 | |
SPRING | 10 | |
SUMMER | 6 | |
FALL | 3 |
United States | 36 | |
Canada | 2 |