Since the 1970s, a small slice of the population in Bristol, Taos, Windsor and dozens of other towns has been tormented by a persistent low-frequency hum — like an idling diesel engine that never shuts off, louder at night, impossible to record. Some hums were traced to a steel furnace or a factory fan. Most never were, and the newest theory says the sound may be coming from inside the listener's own ear.
The map of the whole phenomenon: the famous outbreaks, the handful that were solved, and the majority that were not. Start here to see how widespread it is.
A researcher has spent a decade collecting anonymous reports and pinning them to a world map. Zoom in on your own town and see if anyone near you hears it too.
Dr. Glen MacPherson, who runs the Hum map, lays out the science of what a low-frequency drone even is and why it's so maddeningly hard to pin down.
A 2026 study argues most Hum-hearers aren't picking up an external sound at all — they're experiencing low-frequency tinnitus generated by their own auditory system.
A survey of the eeriest documented cases and the failed investigations, with the actual recordings people managed to capture.
Explains why the sound splits communities — one neighbor is losing sleep and their own family hears nothing at all.
A single case study: a New Zealand professor finally manages to record the Auckland hum, one of the rare times anyone captured the ghost on tape.