How Can Chromecast Connect To Your Friend’s Phones Without Using WiFi? Ultrasonic Sounds

 During yesterday’s I/O keynote, Google announced a rather fantastic new feature coming to the Chromecast: soon, your friends won’t need to be connected to your WiFi to be able to send things to your TV. As long as they’re in the same room, it should just work. But how? The answer: ultrasonic soundwaves, inaudible to the human ear. Read More