Some must know facts about the 'unknown hum' sound are:

  •  A lecturer in University of Columbia has been experiencing a dull low intensity sound since the beginning of 2012. He dismissed it as some background nuisance like car traffic or an airplane passing overhead and months after that MacPherson realized that the noise was something abnormal. He died few months after this realisation.
  • There are only about 2 percent of the population living in any given Hum-prone area can hear the sound, and majority of them fall under the age of 55 to 70, according to a 2003 study by acoustical consultant Geoff Leventhall of Surrey, England.

  • The Hum doesn't sound usual, instead it is a steady droning like that of a diesel engine idling down the street.
  • One victim of the Hum said, "It's a kind of torture; sometimes, you just want to scream," Katie Jacques of Leeds, England, told the media. Leeds is one among those several places in Great Britain where the Hum has recently appeared.

  • The ones who suffer from the Hum complain of headaches, nausea, dizziness, nosebleeds and sleep disturbances. At least one suicide in the United Kingdom has been blamed on the Hum, according to media reports.
  • According to studies based on Hum, one in every 50 experience the Hum and are mostly heard in isolated areas around the world. This Hum sound is heard louder in interiors than exteriors and can penetrate through wooden houses easily.

  • Most cases of Hum have been reported from Leeds, Bristol, and Largs, Scotland in UK, Taos, New Mexico, and Bondi Beach in Sydney, and some isolated parts of Asia.

Source: mentalfloss, science.mic, livescience, BBC report

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