Growing up we used to hear a sound like the one video that was loud. We were always told and believed it to be the Pratt & Whitney plant testing engines. Still hear it from time to time, but not as often. That plant isn't close to where I live - probably 30 or more miles. Most people could hear it though.
My mother can hear sounds most people can't. She starts to get ill in some stores if she stays too long. Thinks it's the security systems or something. I find I can't stay in those same stores a long time or I start to feel ill or very stressed (most of the time it's the very stressed feeling). I don't hear anything though. I often hear things other can't, but I always assumed it was higher frequencies.
My mother can hear sounds most people can't. She starts to get ill in some stores if she stays too long. Thinks it's the security systems or something. I find I can't stay in those same stores a long time or I start to feel ill or very stressed (most of the time it's the very stressed feeling). I don't hear anything though. I often hear things other can't, but I always assumed it was higher frequencies.