sound mystery
The Strange Hums Heard Around The World | Sound Mysteries

From Canada to the U.K., a strange hum plagues citizens. Find out what is causing these low frequency hums in this episode of Sound Mysteries. Subscribe to Gizmodo: https://goo.gl/YTRLAE Visit us at: http://www.gizmodo.com/ Like us at: https://www.facebook.com/gizmodo Follow us at: ...

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