Search our collection of background (non-event) articles from news media, science journals and other sources.
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1 | 1 | 1 | 4 | 2 | 8 | 18 | 55 | 19 | 24 | 26 | 63 | 40 |
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32 | 19 | 16 | 17 | 19 | 31 | 16 | 24 | 29 | 22 | 23 | 14 |
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SUMMER | 55 | |
FALL | 54 | |
WINTER | 51 | |
SPRING | 28 |
United States | 140 | |
Canada | 25 | |
Russia | 13 | |
Norway | 6 | |
Australia | 2 | |
Iceland | 2 | |
Sweden | 2 | |
Afghanistan | 1 | |
Estonia | 1 | |
Greece | 1 | |
Greenland | 1 | |
Guatemala | 1 | |
Japan | 1 | |
Saint Vincent and the Grenadines | 1 | |
Vietnam | 1 |