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There’s A Certain Sound That Makes 2% Of People Lose Their Minds — Are You One Of Them?

The hum is a low-frequency humming or a rumbling sound, like a truck idling, that only 2-5% of the population can hear. Hum ...
Popular Mechanics

A Ghostly Nighttime Hum Is Invading Random Towns. Scientists Don't Know What It Means.

A mysterious, low-frequency noise has settled over the small town of Omagh in Northern Ireland, and is keeping people awake. It’s called “The Hum,” and reports of this phenomenon have been popping up ...
HeraldNet

Skeptics discount low hum theories

This low hum is hardly ho-hum. People in the Stanwood and Camano Island area told The Herald in an Oct. 22 story about a bizarre low hum they were hearing that won’t go away. Since then, the story has ...
Ars Technica

Case vibration noise: repeating low hum, like a huge fan at low speeds

Ok, you know the sound those GIANT fans make in movies, like the huge turbines in massive air vents, the blade goes by slowly making that "whoosh" sound that's a low frequency sound.<BR><BR>My ...
Yahoo

For some with ADHD, the low rumble of brown noise quiets the brain

By contrast, white noise, which is also a broadband sound, includes all the frequencies that the human ear can hear - think of television static or a whirring fan. Some people find white noise ...