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How Audi's New H-Tron Fuel Cell Engine Left Nothing Behind
Car maker Skoda created tiny digital billboards in parking spots around town. As drivers backed into those spaces, the billboard light up and appeared on their reverse dash cameras. Audi used steam machines to project images of its new H-Tron fuel cell engine after it was unveiled back in 2015. The image would linger in the air for a minute then disappear leaving nothing behind but water vapor.