There's Life Above 20 Kilohertz!

[softspeaker]

A Survey of Musical Instrument Spectra to 102.4 KHz

http://www.cco.caltech.edu/~boyk/spectra/spectra.htm

https://biology.stackexchange.com/quest ... ove-20-khz

[softspeaker]

The World Beyond 20kHz

http://recordinghacks.com/articles/the- ... ond-20khz/

Using a study of the human hearing mechanism as his foundation, Earthworks’ founder David E Blackmer presents his arguments for,
and his vision of, high-definition audio.

[softspeaker]

Inaudible High-Frequency Sounds Affect Brain Activity: Hypersonic Effect

http://jn.physiology.org/content/83/6/3548.full