Polar vortex: What is it and how does it happen?
The deep freeze gripping much of the US has been blamed on a polar vortex. Here's what that means.
from BBC News - Home https://bbc.in/2Sex5LW
from BBC News - Home https://bbc.in/2Sex5LW
New top story on Hacker News: The Bicycle Thief
The Bicycle Thief 9 by herbertl | 2 comments on Hacker News.
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