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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, these are like little ice sheets, a very thin layer of ice, almost floating on the surface of the, a couple 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 it wasn't so they started using GPS and time lapse photography, they were actually able to approve that, which was going on. As I mentioned, centuries ago, people who actually saw those with a massive thought, they would have had absolutely no explanation for them. And that's it for the quiz portion tonight, and just one straight period of peace for you.