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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England enjoy dominant day at Lord's to close in on series win

England enjoy day of dominance with both bat and ball to put themselves in complete control of the second Test against Pakistan, closing day...