Search our collection of background (non-event) articles from news media, science journals and other sources.
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17 | ||
11 | ||
11 | ||
9 | ||
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5 | ||
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75 | ||
52 | ||
37 | ||
32 | ||
24 | ||
8 | ||
7 | ||
5 | ||
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2 | ||
2 | ||
1 | ||
1 | ||
1 | ||
1 | ||
1 | ||
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1 | 11 | 42 | 21 |
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11 | 5 | 9 | 8 | 8 | 10 | 1 | 5 | 2 | 5 | 6 | 5 |
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WINTER | 13 | |
SPRING | 10 | |
SUMMER | 9 | |
FALL | 4 |
United States | 40 | |
Canada | 3 |