Rare cloud formation seen in Antarctica

(AP) -- Some of the coldest temperatures on Earth brought a rare cloud formation to the skies over Antarctica, scientists said Tuesday.

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<p><a href="http://www.physorg.com/news73623346.html">Rare cloud formation seen in Antarctica</a></p> <p>(AP) -- Some of the coldest temperatures on Earth brought a rare cloud formation to the skies over Antarctica, scientists said Tuesday.</p>