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And again with this, you're all right to a certain extent. You all have an element of the answer in here, consists of wind and frozen water, some little ice sheets, like little ice sheets, and layers of ice, almost floating on the surface of the desert. And you have these winds come up in between the wind and this lubricating layer of ice. That's what causes these boulders to move. And I once saw these started using GPS and time lapse photography, they were actually able to improve that which was going on. I was going to imagine that centuries ago people who actually saw those with a muscle thought, they would have had absolutely no explanation for them. And that's it for the quiz portion of it, and just one straight period of peace for you.