Search our collection of background (non-event) articles from news media, science journals and other sources.
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90 | 170 |
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31 | 13 | 15 | 23 | 22 | 21 | 32 | 13 | 3 | 36 | 27 | 24 |
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SUMMER | 16 | |
WINTER | 13 | |
SPRING | 7 | |
FALL | 6 |
United States | 95 | |
Canada | 18 | |
Russia | 7 | |
Norway | 3 | |
Iceland | 2 | |
Brazil | 1 | |
China | 1 | |
Ireland | 1 | |
Italy | 1 | |
Sweden | 1 | |
United Kingdom | 1 |