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  2. The Hum - Wikipedia

    en.wikipedia.org/wiki/The_Hum

    The first was a 36 Hz tone from a cooling tower at the local DaimlerChrysler casting plant and the second was a 10 Hz tone from an air compressor intake at the Haynes International plant. [21] After those devices were corrected, however, reports of the hum persisted.

  3. Forest Grove Sound - Wikipedia

    en.wikipedia.org/wiki/Forest_Grove_Sound

    In February 2016, a high-pitched noise was heard intermittently at night in Forest Grove, Oregon. The Department of Forestry determined that their equipment was not the cause of the sound. [1] The news about the noise was first shared with Dave Nemeyer by a Forest Grove resident, who posted a video of it on the city's Facebook page. [2]

  4. Resonating device - Wikipedia

    en.wikipedia.org/wiki/Resonating_device

    A resonating device is a structure used by an animal that improves the quality of its vocalizations through amplifying the sound produced via acoustic resonance.The benefit of such an adaptation is that the call's volume increases while lessening the necessary energy expenditure otherwise required to make such a sound.

  5. Drain-waste-vent system - Wikipedia

    en.wikipedia.org/wiki/Drain-waste-vent_system

    A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.

  6. 20 Plant Mistakes That'll Drain Your Wallet - AOL

    www.aol.com/20-plant-mistakes-thatll-drain...

    The plant needs a few weeks to settle into its new home (like any new arrival), because repotting the instant it arrives might cause shock. You can both take a breather for a while. This article ...

  7. 6 of the Most Common Home Renovations — Are They Worth It ...

    www.aol.com/finance/6-most-common-home...

    With home prices still on the rise in every region of the U.S., 63% of homeowners say they'd rather remodel their homes than move to renovated homes, according to an October survey by Clever Real...

  8. Siren (alarm) - Wikipedia

    en.wikipedia.org/wiki/Siren_(alarm)

    In a pneumatic siren, the stator is the part which cuts off and reopens air as rotating blades of a chopper move past the port holes of the stator, generating sound. The pitch of the siren's sound is a function of the speed of the rotor and the number of holes in the stator. A siren with only one row of ports is called a single tone siren.

  9. Phil Collins reveals health issue, 'shock' of being unable to ...

    www.aol.com/phil-collins-reveals-health-issue...

    For Phil Collins, decades of rock stardom have not come without a cost.. In "Phil Collins: Drummer First," a new documentary released Wednesday, the musician opened up about the health toll of ...

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