Search our collection of background (non-event) articles from news media, science journals and other sources.
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Transportation | 5 | |
Cultural Impact | 2 | |
Economic Impact | 2 | |
Food Security | 2 | |
Safety | 2 | |
Energy | 1 | |
Pets | 1 |
1 | 4 |
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United States | 2 | |
Canada | 1 |