Researchers have created a new sound wave director that can target specific ports and mute sound everywhere else.
Full story: https://bgr.com/science/crazy-new-device-plays-directional-sound-waves-that-only-the-target-can-hear/
Full story: https://bgr.com/science/crazy-new-device-plays-directional-sound-waves-that-only-the-target-can-hear/