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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Thousands of Parisians evacuated as WW2 bomb detonated

Residents within a 450m radius of the device were told to leave their homes while it was neutralised. from BBC News https://ift.tt/mBNvAhd...