Search our collection of background (non-event) articles from news media, science journals and other sources.
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17 | ||
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11 | ||
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5 | ||
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3 | ||
2 | ||
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7 | 41 | 18 |
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5 | 1 | 11 | 8 | 5 | 10 | 4 | 7 | 6 | 5 | 2 | 2 |
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SUMMER | 12 | |
SPRING | 9 | |
FALL | 3 | |
WINTER | 2 |
United States | 27 | |
Canada | 5 | |
Norway | 3 | |
Russia | 2 | |
Ireland | 1 | |
Spain | 1 |