An ice crust builds up on a warning sign that reads “Caution Ice” on the Brocken mountain peak near Schierke, Germany, 19 November 2014. Meteorologists say that the Brocken is currently the coldest spot in the Harz mountainous region. At minus 5 degrees Celsius and strong winds on the Brocken peak these days the rain often freezes into strange ice formations. (Photo by Matthias Bein/EPA)
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