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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The court’s decision has heavy symbolic meaning, even if it may have little practical impact.

By Patrick Kingsley from NYT World https://ift.tt/8hc1Wxb