The Hum, a Worldwide Acoustic Mystery, Stumps Researchers

The Hum, a mysterious droning sound, has been
heard in places like Bristol, England, Bondi, Australia
and Taos, N.M. (Taos Pueblo shown).
Credit: Dan Kaplan | Shutterstock.com

The Hum, a Worldwide Acoustic Mystery, Stumps Researchers
July 25, 2013 | Live Science | Marc Lallanilla

It creeps in slowly in the dark of night, and once inside, it almost never goes away.

It's known as the Hum, a steady, droning sound that's heard in places as disparate as Taos, N.M.; Bristol, England; and Largs, Scotland.

But what causes the Hum, and why it only affects a small percentage of the population in certain areas, remain a mystery, despite a number of scientific investigations. [The Top 10 Unexplained Phenomena]