Tolong jelaskan mengenai Suara buatan manusia dari The Hum

Sistem komunikasi berfrekuensi sangat kecil

Friedrich, Samantha M. Resident irritated by 'hum' , The Thomaston Express, May 26, 2006. - Local Resident Experiencing the hum

The Guardian staff. What's that noise?, The Guardian, October 18, 2001. - Article on the Largs Hum (Scotland) and the Hum in general.

Pilkington, Mark. Humdinger, The Guardian, July 22, 2004. - General background.

Tanimoto, Toshiro (2008). Geophysics: Humming a different tune. In: Nature 452: 539.

National Public Radio USA. The Buzz behind Auckland's Hum