Scientists May Have Finally Solved the Mystery of the Strange Hum Heard Around the World

A mysterious low-frequency sound known as The Hum has been reported around the world for decades, leaving researchers searching for its source. Imagine lying in bed late at night and hearing a faint engine-like drone that seems to come from somewhere outside. You check the windows, listen for traffic, and search for a nearby machine. [...]

from SciTechDaily https://ift.tt/8HbumvO