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  2. List of unexplained sounds - Wikipedia

    en.wikipedia.org/wiki/List_of_unexplained_sounds

    Upsweep is an unidentified sound detected on the American NOAA's equatorial autonomous hydrophone arrays. This sound was present when the Pacific Marine Environmental Laboratory began recording its sound surveillance system, SOSUS, in August 1991. It consists of a long train of narrow-band upsweeping sounds of several seconds in duration each.

  3. Category:Unexplained phenomena - Wikipedia

    en.wikipedia.org/wiki/Category:Unexplained_phenomena

    Unidentified sounds (11 P) U. Unidentified flying objects (5 C, 8 P) W. ... Pages in category "Unexplained phenomena" The following 32 pages are in this category, out ...

  4. Category:Unidentified sounds - Wikipedia

    en.wikipedia.org/wiki/Category:Unidentified_sounds

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Help; Learn to edit; Community portal; Recent changes; Upload file

  5. I heard strange noises behind a wall in my home — I was ...

    www.aol.com/heard-strange-noises-behind-wall...

    The claws-strophobic clip showed homeowner Lacy Day and several men cutting away a square panel of plasterboard to reveal the “source of the noise” in their wall. The wall eventually came down ...

  6. NASA offers explanation for bizarre 'trumpet noise' phenomena

    www.aol.com/news/2015-05-22-nasa-attempts-to...

    Since this still lacks scientific confirmation, rampant speculation continues about potential extra-terrestrial theories for these "trumpet noises." But don't count NASA as a UFO-doubter just yet.

  7. '3 Body Problem': Netflix sci-fi show makes mysterious Ohio ...

    www.aol.com/3-body-problem-netflix-sci-173531585...

    An mysterious signal recorded by an Ohio State University astronomer in 1977 is getting a fictional explanation thanks to "3 Body Problem."

  8. Brown note - Wikipedia

    en.wikipedia.org/wiki/Brown_note

    Considered an urban myth, the name is a metonym for the common color of human faeces. Attempts to demonstrate the existence of a "brown note" using sound waves transmitted through the air have failed. Frequencies supposedly involved are between 5 and 9 Hz, which are below the lower frequency limit of human hearing. High-power sound waves below ...

  9. Mysterious high-pitched tone keeps Oregon residents up ... - AOL

    www.aol.com/article/2016/02/22/mysterious-high...

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