Search our collection of background (non-event) articles from news media, science journals and other sources.
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| 238 23% | ||
| 160 15% | ||
| 154 15% | ||
| 151 15% | ||
| 136 13% | ||
| 121 12% | ||
| 112 11% | ||
| 97 9% | ||
| 97 9% | ||
| 78 8% | ||
| 53 5% | ||
| 48 5% | ||
| 45 4% | ||
| 24 2% | ||
| 15 1% | ||
| 14 1% | ||
| 11 1% | ||
| 7 <1% | ||
| 7 <1% | ||
| 5 <1% |
| 184 18% | ||
| 181 17% | ||
| 162 16% | ||
| 94 9% | ||
| 58 6% | ||
| 57 5% | ||
| 55 5% | ||
| 47 5% | ||
| 45 4% | ||
| 45 4% | ||
| 44 4% | ||
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| 39 4% | ||
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| 34 3% | ||
| 27 3% | ||
| 24 2% | ||
| 23 2% | ||
| 11 1% | ||
| 10 <1% | ||
| 9 <1% | ||
| 8 <1% | ||
| 6 <1% | ||
| 6 <1% | ||
| 4 <1% | ||
| 4 <1% | ||
| 4 <1% | ||
| 4 <1% | ||
| 3 <1% | ||
| 2 <1% | ||
| 2 <1% |
| 153 15% | ||
| 153 15% | ||
| 118 11% | ||
| 112 11% | ||
| 87 8% | ||
| 80 8% | ||
| 71 7% | ||
| 62 6% | ||
| 53 5% | ||
| 51 5% | ||
| 41 4% | ||
| 35 3% | ||
| 32 3% | ||
| 28 3% | ||
| 23 2% | ||
| 23 2% | ||
| 21 2% | ||
| 19 2% | ||
| 15 1% | ||
| 12 1% | ||
| 12 1% | ||
| 8 <1% | ||
| 2 <1% |
| 2 | 1 | 1 | 1 | 2 | 1 | 2 | 2 | 4 | 4 | 7 | 2 | 11 | 17 | 47 | 167 | 345 | 127 | 163 | 4 | 1 |
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| 80 | 47 | 62 | 66 | 68 | 86 | 79 | 114 | 95 | 62 | 77 | 75 |
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| SUMMER | 279 | |
| FALL | 234 | |
| WINTER | 202 | |
| SPRING | 196 |
| United States | 291 | |
| Canada | 93 | |
| Russia | 32 | |
| Norway | 19 | |
| Iceland | 16 | |
| Finland | 8 | |
| Greenland | 8 | |
| Svalbard and Jan Mayen | 6 | |
| Sweden | 6 | |
| United Kingdom | 6 | |
| Australia | 3 | |
| Japan | 3 | |
| Mexico | 3 | |
| Mongolia | 3 | |
| China | 2 | |
| Czech Republic | 2 | |
| Denmark | 2 | |
| Greece | 2 | |
| Nigeria | 2 | |
| Ukraine | 2 | |
| Afghanistan | 1 | |
| Antarctica | 1 | |
| Cape Verde | 1 | |
| Cocos Islands | 1 | |
| Ecuador | 1 | |
| Estonia | 1 | |
| France | 1 | |
| Guatemala | 1 | |
| Honduras | 1 | |
| India | 1 | |
| Nepal | 1 | |
| Pakistan | 1 | |
| Puerto Rico | 1 | |
| Romania | 1 | |
| Saint Vincent and the Grenadines | 1 | |
| Solomon Islands | 1 | |
| Spain | 1 | |
| Switzerland | 1 | |
| Vietnam | 1 |
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