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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Renoir, Cézanne and Matisse paintings stolen in Italian job

The paintings were taken from a museum in Parma by four masked men in the middle of the night, police say. from BBC News https://ift.tt/x4...