See also:

• Health: Senses: Hearing  (18)
• Science: Technology: Acoustics, Ultrasound and Vibration  (704)

• The Guns of Barisal and Anomalous Sound Propagation - Discussion of research into the physics behind mysterious sounds resembling cannon fire, heard at Barisal, India, and other locations around the world.
• The Hum - Investigation into the cause and adverse health effects of the Bristol Hum, an obnoxious low-frequency noise heard in England. Conclusion is that the hum is due to a pulsed electrical signal.
• Hum Forum - Yahoo Group for discussion of mysterious hums.
• Hum Haunts Indiana City; Its Source Is a Mystery - New York Times article about a mysterious low-frequency noise reported by residents of Kokomo, IN.
• The Moodus Noises - Account of the legends and modern accounts of the mysterious sounds heard in Moodus, Connecticut.
• Taos Hum Page - Information and links about the "Taos Hum," a low throbbing sound heard in quiet locations worldwide, especially in the USA, UK, and northern Europe. It is not detectable by microphones or VLF antennae, and the source is still a mystery.
• Things That Go Boom in the Night - Article about the Moodus (Connecticut) noises and the findings of recent investigations that linked these noises with seismic activity.
• Unexplained Sounds - About.com page gathers together information about mysterious booms, persistent hums, and underground rumblings that defy explanation. Includes audio clips.