Search our collection of background (non-event) articles from news media, science journals and other sources.
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34 | ||
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19 | ||
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13 | ||
9 | ||
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107 | ||
49 | ||
47 | ||
31 | ||
27 | ||
12 | ||
9 | ||
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5 | ||
5 | ||
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2 | ||
2 | ||
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1 | ||
1 |
11 | 63 | 33 |
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18 | 6 | 9 | 10 | 13 | 10 | 2 | 8 | 10 | 9 | 9 | 3 |
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WINTER | 13 | |
SPRING | 12 | |
SUMMER | 11 | |
FALL | 9 |
United States | 56 | |
Canada | 6 | |
Russia | 3 |