- Polar vortex: soap bubble freezes and breaks in Arctic Chicago cold Guardian News
- Polar vortex cold snap sets all-time cold records across the Midwest, kills at least 9 Axios
- Over 20 dead in U.S. polar vortex, frostbite amputations feared Yahoo News
- Why the polar vortex has gripped Chicago and why you may see more of it Chicago Tribune
- Polar vortex: Iowa college student among deaths linked to extreme cold CBS News
- View full coverage on Google News
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