Jared Keller writes:
“The Hum” refers to a mysterious sound heard in places around the world by a small fraction of a local population. It’s characterized by a persistent and invasive low-frequency rumbling or droning noise often accompanied by vibrations. While reports of “unidentified humming sounds” pop up in scientific literature dating back to the 1830s, modern manifestations of the contemporary hum have been widely reported by national media in the United Kingdom, the United States and Australia since the early 1970s.
Regional experiences of the phenomenon vary, and the Hum is often prefixed with the region where the problem centers, like the “Windsor Hum” in Ontario, Canada, the “Taos Hum” in New Mexico, or the “Auckland Hum” for Auckland, New Zealand. Somewhere between 2 and 10% of people can hear the Hum, and inside isolation is no escape. Most sufferers find the noise to be more disturbing indoors and at night. Much to their dismay, the source of the mysterious humming is virtually untraceable.