Our hearing picks up a limited range of sounds, limits that were used successfully to keep teenagers from congregating outside British grocery stores by a device called the “teenage sound repeller." ...

PHILADELPHIA (WPVI) -- Some young people are hearing a high pitched frequency at parks around the city. According to Philadelphia's Parks and Recreation department, a device called "The Mosquito" has ...

The Spokane City Council once again balked Monday on a proposal to ban devices that emit high-pitched noises to disperse young and homeless people from areas near downtown businesses. On Monday, the ...