COMING TO YOUR CAR: Wiperless Windshields? “Of course, the Woking guys aren’t going to reveal how exactly the system works, but it’s likely an ultrasound-based concept. By integrating a transducer, waves abound 30kHz would bounce around making tiny vibrations, which would in turn bounce off rain and other road splatter. As cool as ‘sources inside the military’ sounds (we like the idea of Stephenson grilling some poor engineer), this is also the same tech your dentist uses to get the gunk off of your teeth.”