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

There are lots of videos around.

      • SoftestSapphic@lemmy.world
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        3 hours ago

        “Let every dirty, lousy tramp arm himself with a revolver or a knife, and lay in wait on the steps of the palaces of the rich and stab or shoot the owners as they come out. Let us kill them without mercy, and let it be a war of extermination.”

        • Lucy Parsons
        • TheLadyAugust@lemmy.world
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          28 minutes ago

          My understanding of this is that it is caused partly by bone conduction. It might be possible that closing your ears by pressing frimly on your “tragus” or on the “mastoid process” could reduce the associated effects. The mastoid process is where the jaw meets the ear.