Search our collection of background (non-event) articles from news media, science journals and other sources.
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11 | ||
8 | ||
5 | ||
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68 | ||
32 | ||
30 | ||
19 | ||
14 | ||
7 | ||
6 | ||
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3 | ||
3 | ||
3 | ||
1 | ||
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1 |
37 | 31 |
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11 | 3 | 3 | 6 | 8 | 6 | 2 | 4 | 8 | 8 | 8 | 1 |
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SUMMER | 7 | |
FALL | 6 | |
SPRING | 1 | |
WINTER | 1 |
United States | 32 | |
Canada | 6 | |
Russia | 3 |