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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After 16 years in power, could Viktor Orban finally be unseated?

Hungary is going to the polls in nine days - after 16 years in power, can Viktor Orban be unseated? from BBC News https://ift.tt/yHvKnQI