In the town of Taos, new Mexico residents were baffled when many began to hear a low-frequency hum in the 1990s. Described as a Hum, buzz, and even whir, the annoying sound began to puzzle and frustrate the 2% of the population that could hear it. Despite researchers looking into the phenomenon, they could not pinpoint the sound’s origin. Some began to believe it was caused by hysteria, suggesting that those hearing the sound only heard it because they thought they could rather than there being an actual sound, while others thought it was caused by unusual acoustics. The hum has also been heard in other areas of the United states, Canada, the United Kingdom and Australia.