How The Hum Works
![How The Hum Works](https://www.podcastworld.io/podcast-images/stuff-you-should-know-ptoo9p5s.webp)
There is a mysterious droning sound often described as like a diesel engine idling that is severely impacting the quality of life of 2 percent of people in places around the world. The thing is, no one knows what's causing it - or if it actually exists.
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