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There's a place in Death Valley and it's referred to as the Racetrack Playa. And this is where all for centuries and centuries it's been recorded. These rocks and boulders travel across the desert floor. They can see the tracings from them, which is why it's referred to as a racetrack. And so how do those stones, they're off for off sailing stones. How do those stones move across the racetrack that playa in the Death Valley? I got it. I think they're moved by the wind. The wind wind is either wet or frozen. Believe it or not, the wind is so kind of frosty. The frosty gets there between that and the wind that makes them slide across.