Search our collection of background (non-event) articles from news media, science journals and other sources.
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21 | 13 | 41 | 26 |
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9 | 3 | 15 | 9 | 10 | 13 | 9 | 9 | 8 | 6 | 3 | 7 |
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SUMMER | 19 | |
SPRING | 17 | |
WINTER | 13 | |
FALL | 6 |
United States | 38 | |
Canada | 7 | |
Norway | 4 | |
Russia | 3 | |
China | 1 | |
Ireland | 1 | |
Italy | 1 | |
Pakistan | 1 | |
Spain | 1 | |
Vietnam | 1 |