sip and puff technology to get around, which is relatively lo-fi by some standards. Now, a special retainer with magnetic sensors could bring mobility into the smartphone age. Developed at Georgia Tech, the Tongue Drive System uses a magnetic piercing to track lingual gestures. The sensors then transmit data to an iOS app that translates it to on-screen or a joystick movement. Earlier versions used a headset, but the prototype revealed at the International Solid State Circuits Conference in San Francisco, is hoped to be more comfortable and discreet. The system is currently being trialled by 11 participants with high-level spinal-cord injuries, with larger trials planned.