Search our collection of background (non-event) articles from news media, science journals and other sources.
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17 | ||
10 | ||
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66 | ||
46 | ||
33 | ||
24 | ||
20 | ||
8 | ||
5 | ||
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2 | ||
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6 | 42 | 18 |
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11 | 4 | 9 | 8 | 8 | 5 | 1 | 4 | 2 | 4 | 5 | 5 |
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WINTER | 12 | |
SPRING | 10 | |
SUMMER | 6 | |
FALL | 2 |
United States | 37 | |
Canada | 2 |