As someone who spent the better part of their early teens and twenties listening to music WAY too loud, I am familiar with the term tinnitus (Archer fans anyone). It’s that faint ringing or humming in the ear that comes as soon as it goes. It’s annoying, but usually bearable and can be linked to aging and other underlying causes; like listening to Metallica albums way to loud for way to long. But what if I said there was another phenomenon of sorts that has people wondering, what that humming sound right here in Iowa, or even crazier the whole world!
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Some residents across Iowa have reported hearing a steady, low-frequency sound that seems to have no obvious source. It’s often described as a distant diesel engine idling, a deep droning rumble, or a faint mechanical hum that sits just under everyday noise. In many cases, people say it becomes more noticeable at night, especially indoors when everything else is quiet.
According to data collected in the World Hum Map and Database Project, cases have been logged in several Iowa cities: Des Moines, Davenport, Iowa City, and Cedar Rapids. That pattern fits a global trend, with most hum reports coming from urban or suburban areas near larger population centers, rather than remote rural regions.
So what exactly is the “World Hum”?
The World Hum is not considered a single confirmed sound source. Instead, it’s a label used to describe a cluster of similar experiences reported around the world. The World Hum Map project, created by researcher Dr. Glen MacPherson, was designed to collect these reports and look for patterns. MacPherson, a former University of British Columbia educator and researcher, became interested in the phenomenon after experiencing it himself and discovering a larger online community reporting similar symptoms.
On the project site, the Hum is described as an unusual low-frequency perception that some people experience while others in the same location don’t hear at all. Researchers involved with the project estimate that a small percentage of the population may experience this under certain conditions. Some studies say around 2% of the popluation.
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