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I heard about thie glass where you can adjust the level of tint on it. From what I heard it works by using a special fluid that contains special light absorbing microscopic partiles. This fluid is then suspeneded between sheets of film. When an electric voltage goes through this stuff the particles allign themselves at various angles, which allow different levels of transparency. Apparently this technology isn't quite that new since it was used before by Ferrari on some limited edition car which they put out awhile ago, but some company who's name I forgot is planning on mass producing this stuff for everyday vehicles. So in the future we won't need sunglasses when we drive since we'll have entire windshields set to filter out all the light now.
it will stiil probably be illegal to put on the front windows in states like california