Far-off mechanical sounds? Meteors colliding with the atmosphere? Alien interference? There are a lot of theories to explain the phenomenon widely known as the Global Hum.
"It is usually a mechanical sounding hum or vibration or noise that is heard," says paranormal enthusiast Mike Pederson. These sounds are supposedly audible to roughly two percent of the population. Reports of the phenomenon come from various areas around the world and, as yet, there is no agreed upon explanation.
These sounds have been reported in urban regions where mechanical sounds are more likely to be heard, but reports from deep in wilderness areas are also common and far more difficult to explain. As to suggested paranormal origins, Pederson remains skeptical. "There's always an explanation."
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