Picture of the Day: This is Hair Ice

Photograph by Christian Mätzler

You may have never seen or heard of it, but hair ice—a type of ice that has the shape of fine, silky hairs and resembles white candy floss—is remarkable. It grows on the rotten branches of certain trees when the weather conditions are just right, usually during humid winter nights when the air temperature drops slightly below 0°C.

Now, a team of scientists in Germany and Switzerland have identified the missing ingredient that gives hair ice its...

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