US weather: Boiling water to snow web craze
Weather records have plummeted across North America, with the most extreme arctic blasts affecting about 190 million people.
Some parts of the US were as cold as -37C (-35F) - cold enough for boiling water to turn to snow when thrown in the air.
Many Americans have taken to social media to show off their demonstrations of the rare phenomenon.
However a number of injuries have been reported while attempting it.
- From the section US & Canada