Parks and Recreation Centers Are Using Sonic Devices That Play High-Pitched Noises To Repel Teens

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NPR reports of the various parks and recreation centers in North America that are using sonic devices to repel teens from the premises. Philadelphia, for example, has 30 parks and recreation centers that are outfitted with a small speaker called the Mosquito. “It blares a constant, high-pitched ringing noise all night long — but one […]


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