Search our collection of background (non-event) articles from news media, science journals and other sources.
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7 | 12 |
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2 | 1 | 3 | 1 | 1 | 2 | 1 | 5 | 2 | 1 |
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FALL | 1 | |
SUMMER | 1 | |
WINTER | 1 |
United States | 11 | |
Canada | 1 | |
China | 1 | |
Iceland | 1 |