The Global Hum: Unraveling the Persistent Low-Frequency Mystery
The global hum is a persistent low-frequency noise reported by thousands since the 1970s, with notable cases from Bristol to Taos; the Worldwide Hum Project crowdsources reports but no single cause has been identified. Theories range from external sources like microseismic activity and pipelines to perceptual factors such as low-frequency tinnitus or atypical auditory processing. A 2026 NTNU study leans toward subjective tinnitus as a plausible explanation, though researchers believe multiple causes likely exist. For now, experts advise relaxation and reducing focus on the sound rather than seeking a definitive cure.