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Can You Hear It? Sonic Devices Play High-Pitched Noises To Repel Teens

Politics

Can You Hear It? Sonic Devices Play High-Pitched Noises To Repel Teens

NPR - Michaela Winberg

In Philadelphia, 30 parks and recreation centers are outfitted with a small speaker called the Mosquito. It blares a constant, high-pitched ringing noise all night long — but one that only teenagers and young adults can hear. Anyone over age 25 is supposed to be immune because, basically, their ear …

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