World Wide Hum

https://www.livescience.com/43519-taos-hum.html
http://news.bbc.co.uk/1/hi/uk/8056284.stm
https://www.independent.co.uk/climate-change/news/have-you-heard-the-hum-mystery-of-earth-s-low-droning-noise-could-now-be-solved-10182111.html
https://www.csmonitor.com/1985/0812/ahum.html
https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.518.9056&rep=rep1&type=pdf
https://www.atlasobscura.com/articles/the-persistent-mystery-of-the-kokomo-hum
https://www.cbc.ca/news/canada/windsor/windsor-hum-zug-island-us-steel-1.5665100
https://theconversation.com/cracking-the-mystery-of-the-worldwide-hum-60296
https://www.bristolpost.co.uk/news/bristol-news/bristol-hum-driven-brislington-mum-6094771
https://www.kalw.org/news/2021-11-01/the-hum-a-worldwide-mystery-sound-explained
https://www.athlonoutdoors.com/article/infrasound-the-hidden-horror-movie-sound/
https://www.atlasobscura.com/articles/how-the-hidden-sounds-of-horror-movie-soundtracks-freak-you-out