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
from BBC News - World https://bbc.in/2Sex5LW
ICYMI: Saving baby turtles to underwater hockey
From saving baby turtles to underwater hockey, some of the stories you might have missed this week. from BBC News - World https://ift.tt/2nFQZl5
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