Stuff You Should Know

How The Hum Works

Stuff You Should Know

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. Learn more about your ad-choices at https://www.iheartpodcastnetwork.com

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