09-02-2020, 06:54 AM
Search on YouTube for "727 hertz". One example.
https://www.youtube.com/watch?v=AYxpI_WZwgQ
Kind of irritating to listen to.
Cheers
https://www.youtube.com/watch?v=AYxpI_WZwgQ
Kind of irritating to listen to.
Cheers
Location: The lost world, Elsewhen