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Sonic Science: The High-Frequency Hearing Test

Uploader: Vushicage 1 month ago  
91% 29 votes

Some security companies recently began manufacturing machines designed to emit an annoying sound that prevents teenagers from loitering outside stores and shops. We put a sound on Sgt. They can also produce these infrasonic calls at extremely high volumes, around 85 to 95 decibels. Elephants can hear and make sounds well below human range, to as low as 14 to 16 hertz. We have some video evidence. Although people could hear portions of the concerto Pussy Riot staged to protest Internet censorship, the melody is a whole lot more complex from the feline point of view.

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