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Parks in Philadelphia Are Installing High-Pitched Noise Machines to Keep Teenagers Away

The parks in Philadelphia are getting criticized for installing noise machines that make a high-pitched sound.  Only people under 25 can really hear the noise . . . so they're designed to keep teenagers out of the parks at night.

You can hear the audio at MovingSoundTech.com on the lower right hand of the screen.  And yes, if you don't hear anything, that means you're old.