The Hypersonic Theory of Gebbensleben “The word hypersonic is occasionally used to refer to sound above the frequency of about 1 GHz, i.e. for very high frequency ultrasound. In everyday phenomena such noise does not matter. However the engineer Reiner Gebbensleben (born 1939 Magdeburg) from Dresden, Germany represents the pseudo-scientific view that many technical and natural processes are based in the presence of hypersonic. In his opinion hypersonic is, among other things, perceptible by humans and in truth electrosmog is hypersonic.” The above is a definition of hypersonic quoted/translated [...]