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 - World https://bbc.in/2Sex5LW

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Iran attacks damage 20 US military sites since start of war, satellite images show

Analysts told BBC Verify that Tehran's strikes were more extensive than publicly acknowledged. from BBC News https://ift.tt/aCBhRQp