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

By YULIYA PARSHINA-KOTTAS, KARTHIK PATANJALI, JEREMY WHITE, BENJAMIN WILHELM and EVAN GROTHJAN from NYT Science https://nyti.ms/2B9tBka

The Jerusalem event was the first since the election of a hardline government with homophobic ministers. from BBC News - World https://ift.tt/qOnN6vP

By BY SUSAN E. RICE from NYT Opinion https://ift.tt/2VMHYFJ

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