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 ...