Go to todayilearned by TIL there are sound frequencies that can only be heard by teenagers and some stores use devices that emit these sounds to keep teenagers from loitering. #ifttt #reddit #til

Reddit - Dive into anything Go to todayilearned by TIL there are sound frequencies that can only be heard by teenagers and some stores use devices that emit these sounds to keep teenagers from loitering. Tags: ifttt, reddit, til via Pocket https://ift.tt/6HJsVaP April 25, 2023 at 12:44AM