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
from BBC News - World https://bbc.in/2Sex5LW
As Biden prepares to extract troops, we ask three Americans with personal connections what they think. from BBC News - World https://ift.tt/2Qk74vu
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