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  2. The Hum - Wikipedia

    en.wikipedia.org/wiki/The_Hum

    The Hum is a name often given to widespread reports of a persistent and invasive low-frequency humming, rumbling, or droning noise audible to many but not all people. Hums have been reported all over the world, including the United States, the United Kingdom, Australia and Canada.

  3. Forced-air gas - Wikipedia

    en.wikipedia.org/wiki/Forced-air_gas

    Older furnaces sometimes relied on gravity instead of a blower to circulate air. [1]Gas-fired forced-air furnaces have a burner in the furnace fueled by natural gas.A blower forces cold air through a heat exchanger and then through duct-work that distributes the hot air through the building. [2]

  4. Stomach rumble - Wikipedia

    en.wikipedia.org/wiki/Stomach_rumble

    A stomach rumble, also known as a bowel sound, peristaltic sound, abdominal sound, bubble gut or borborygmus (pronounced / ˌ b ɔːr b ə ˈ r ɪ ɡ m ə s /; plural borborygmi), is a rumbling, growling or gurgling noise produced by movement of the contents of the gastrointestinal tract as they are propelled through the small intestine by a series of muscle contractions called peristalsis. [1]

  5. Strange rumbling noises in California house turn out to be 5 ...

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  6. List of unexplained sounds - Wikipedia

    en.wikipedia.org/wiki/List_of_unexplained_sounds

    It was loud enough to be heard over the entire Equatorial Pacific Ocean autonomous hydrophone array, with a duration of about 2 minutes and 43 seconds. Due to the uncertainty of the arrival azimuth , the point of origin could only be narrowed to between Bransfield Straits and Cape Adare .

  7. Late-night rumbling noise overhead mystified Raleigh ... - AOL

    www.aol.com/news/night-rumbling-noise-overhead...

    Some across the Triangle reported very loud aircraft overnight Wednesday. Late-night rumbling noise overhead mystified Raleigh residents. Here’s the explanation.

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