2. The Taos Hum
The Taos Hum is a persistent, low-frequency sound that has baffled residents and visitors of Taos, New Mexico, for decades. Despite numerous studies, its exact origin remains elusive. Some experts point to possible geological or atmospheric sources, while others believe it could be a psychological phenomenon affecting only certain individuals. Adding to the mystery, similar hums have been reported in other locations around the world. Learn more about this curious phenomenon at BBC News.