Search our collection of background (non-event) articles from news media, science journals and other sources.
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24 | ||
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21 | ||
15 | ||
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144 | ||
57 | ||
51 | ||
36 | ||
35 | ||
18 | ||
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9 | ||
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5 | ||
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1 |
22 | 26 | 63 | 33 |
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23 | 13 | 14 | 15 | 15 | 14 | 6 | 9 | 11 | 9 | 10 | 5 |
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WINTER | 27 | |
SPRING | 20 | |
SUMMER | 20 | |
FALL | 11 |
United States | 72 | |
Canada | 10 | |
Russia | 4 | |
Estonia | 1 | |
Saint Vincent and the Grenadines | 1 | |
Vietnam | 1 |