World's top 10 fascinating natural phenomena (10)
13:21, November 20, 2009 
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10. The Hum
"The Hum" is the common name of a series of phenomena involving a persistent and invasive low-frequency humming noise not audible to all people. Hums have been reported in various geographical locations. In some cases a source has been located. A well-known case was reported in Taos, New Mexico, and thus the Hum is sometimes called the Taos Hum. They have been reported all over the world, especially in Europe: a Hum on the Big Island of Hawaii, typically related to volcanic action, is heard in locations dozens of miles apart. The Hum is most often described as sounding somewhat like a distant idling diesel engine. Difficult to detect with microphones, its source and nature are unknown.
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"The Hum" is the common name of a series of phenomena involving a persistent and invasive low-frequency humming noise not audible to all people. Hums have been reported in various geographical locations. In some cases a source has been located. A well-known case was reported in Taos, New Mexico, and thus the Hum is sometimes called the Taos Hum. They have been reported all over the world, especially in Europe: a Hum on the Big Island of Hawaii, typically related to volcanic action, is heard in locations dozens of miles apart. The Hum is most often described as sounding somewhat like a distant idling diesel engine. Difficult to detect with microphones, its source and nature are unknown.
oddee.com contributes to this article.
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http://english.people.com.cn/90001/90782/6819215.pdf