It is so cold in Chicago they're lighting railroad tracks on fire - Ars Technica

1. It is so cold in Chicago they're lighting railroad tracks on fire  Ars Technica
2. What's a polar vortex? What's the lowest temperature ever recorded in the U.S.?  AL.com
3. N.J. weather: Watch for snow squalls, flash freeze as dangerous cold from polar vortex grips state  NJ.com
4. Do Not Fear the Vortex! (Just be smart)  13WHAM-TV
5. Here's The Real Connection Between The Brutal Polar Vortex And Global Warming  ScienceAlert
6. View full coverage on Google News

http://bit.ly/2MF5m1y http://bit.ly/2PPIwEw