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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How US commerce secretary's Epstein links were uncovered by British whistleblower

Simon Andriesz made the discovery about Howard Lutnick in publicly released Epstein files. from BBC News https://ift.tt/gWX4nNp