Search our collection of background (non-event) articles from news media, science journals and other sources.
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10 | ||
8 | ||
6 | ||
6 | ||
6 | ||
5 | ||
4 | ||
4 | ||
2 | ||
1 | ||
1 | ||
1 | ||
1 |
9 | ||
8 | ||
8 | ||
7 | ||
5 | ||
5 | ||
5 | ||
4 | ||
2 | ||
2 | ||
2 | ||
2 | ||
2 | ||
1 | ||
1 | ||
1 | ||
1 |
12 | 20 | 9 |
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SUMMER | 7 | |
SPRING | 2 |
United States | 15 | |
Canada | 4 | |
Russia | 2 | |
Italy | 1 |