I recently found this image of Death Valley on the NASA: Astronomy Picture of the Day website. I liked it so much that it is now part of this site. Futility Closet points out that rocks, like the one in this image, 'sail' extraordinarily well at Racetrack Playa in Death Valley. Nobody has seen them move because it may only occur once every two or three years, but many assume that wind is the culprit.
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