I walked out on Lake Mendota on the isthmus side of the Lakeshore Nature Preserve to see how thick the new ice is and I couldn't stop looking at these amazing bouquets of bubbles, scattered and suspended in the ice. What we call "black ice" is just water that froze with very little air content and so is highly transparent. Usually, snow falls on frozen lakes throughout the winter, covering the ice with frozen air which gives it its usual white look and also insulates the ice. This part of the lake must have been a little choppy as it froze to produce these air pockets. It's ready again for ice skating, and nice to look at, too.
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