Computer enthusiasts have worked out how to reprogram Apple’s iPod music player with their own code using an ingenious acoustic trick. They adapted the component that generates clicks – or “squeaks” – as a user scrolls through the on-screen menu in order to extract vital information from the latest generation of the device. This allowed them to install an alternative operating system and make their iPods run games and other new programs. The project began when Nils Schneider, a 17-year-old compu...