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What is the polar vortex? Why it matters as snow and Arctic cold threaten the Northeast

What is the polar vortex? This article explains what a polar vortex is in simple terms, how it influences winter weather in ...
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This blue morph arctic fox keeps its color all winter

The fabulous winning image in the Grand Prize category of the National Wildlife Federation photo contest captures a blue morph Arctic fox sitting on the high bluffs of St. George Island, Alaska. The ...