A mysterious hum has plagued the Earth for 50 years. Scientists may have finally found its source

Since the 1970s, people across the world have reported hearing an inexplicable low-frequency droning. Scientists now think they know what it is.
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Scientists investigating 50-year global 'earth hum' discovered it may be an 'inside job'

Scientists Investigating 50-Year Global 'Earth Hum' Discovered It May Be an 'Inside Job' ...
Science Daily

The mysterious hum heard around the world may finally have an explanation

The mysterious sound known as The Hum has been reported worldwide for decades, yet its source often remains impossible to ...
Yahoo

‘It brought me to my knees’: The Hum – a mysterious phenomenon that’s baffled the world for decades

Add Yahoo as a preferred source to see more of our stories on Google. It was around 2005 that Simon Payne started hearing it. A strange, low, rumbling sound that travels through walls and floors and ...
AOL

A Mysterious Hum Has Plagued the Earth for 50 Years. Scientists May Have Finally Found Its Source.

"Hearst Magazines and AOL may earn commission or revenue on some items through these links." In the early 1970s, the town of Bristol, U.K., was plagued by a low, persistent hum. It typically occurred ...