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There are hundreds of enormous drawings in the deserts of Peru that can only be seen from the air, and no one seems to know why they exist! These intricate designs were made by removing a layer of sand and gravel from the desert floor, but the finished products include birds, mammals, geometric shapes, and even…humanoid figures! Why would an ancient people devote so much time and effort to making pictures that can only be seen from hundreds of feet in the air? Tune in this week to find out!