It's tempting to assume that the sensors on your mobile devices are trustworthy. Surely something that relies on real-world activity can't lie, right? Unfortunately, that's no longer the case. Scientists have discovered that you can fool mobile devices' motion sensors into registering non-existent data by playing the right sounds. The technique involves playing a tone at the resonant frequency for the spring structures inside accelerometer chips, much in the same way as you might shatter a wine glass. It's not strictly hacking (not in the conventional sense, anyway), but it could lead to an outsider taking control of motion-related features in the right circumstances.