Horror movies are never my thing, they scare the hell out of me, even when I try to create the perception in my mind that it is just a movie, yet I am usually still caught up in the fear. I guess I now understand the reason behind that. The truth is that no matter how hard I try, horror movies are a no go area for me.
Knew most about ultrasound and if I could remember, it's been decades.
Infrasound really sounds new to me.

It really has quite some good and useful applications as you have stated.