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- A polar vortex is hitting 75% of the continental US population this week and the cold that comes with it is no joke.
- Forecasters warn that below-freezing temperatures could give people frostbite and hypothermia in as little as five minutes outside.
- Frostbite is a serious condition that happens when cold temperatures cause skin and tissue to start freezing, killing the cells.
- Watch the video above to learn how wind-chill can drastically affect how long you can last outside in the cold.