Belgrade authorities have used sound weapons on the crowd of protesters. The video description has some educational links.

There are lots of videos around.

    • Sylvartas@lemmy.dbzer0.com
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      13 minutes ago

      Sound is moving air and carries energy. With the right frequency and intensity it could definitely physically fuck you up even if your ears are covered.

      Wikipedia:

      Studies have found that exposure to high intensity ultrasound at frequencies from 700 kHz to 3.6 MHz can cause lung and intestinal damage in mice