![](https://www.nasa.gov/sites/default/files/thumbnails/image/pia21263.jpg)
A grid of small polygons on the Martian rock surface near the right edge of this view may have originated as cracks in drying mud more than 3 billion years ago. via NASA http://www.nasa.gov/image-feature/jpl/pia21263/possible-signs-of-ancient-drying-in-martian-rock
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