Some describe it as sounding like an engine idling just outside the house. Others report hearing a low-frequency rumble. But almost everyone who can hear it—2 percent of the population, by some ...

Islanders in the Outer Hebrides whose lives are being disrupted by a mysterious humming sound say they believe the source is military operations in the North Atlantic. The persistent low frequency ...

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 ...