Google has unveiled technology that can read people's body movements to let devices'understand the social context around them' and make decisions. Developed by Google's Advanced Technology and Products division (ATAP) in San Francisco, the technology consists of chips built into TVs, phones and computers. But rather than using cameras, the tech uses radar – radio waves that are reflected to determine the distance or angle of objects in the vicinity. If built into future devices, the technology could turn down the TV if you nod off or automatically pause Netflix when you leave the sofa. Assisted by machine learning algorithms, it would also generally allow devices to know that someone is approaching or entering their'personal space'. Google has unveiled technology that can read people's body movements to let devices'understand the social context around them' and make decisions, such as flashing up information when you walk by or turning down volume on Radar is an acronym, which stands for Radio detection and ranging.