Ivar Vinkel - Why Do Cats Purr?
https://www.youtube.com/embed/VKIaUqZRuLY
It is possible cats use purring to cure themselves, in addition to the well-known displaying of satisfaction. The possible applications of low-frequency sine audio have been researched in Estonia since 1988. This research has come to the creation and serial production of a vibroacoustic therapy device, says Ivar Vinkel, expert of vibroacoustics at the Tallinn University Competence Centre in Health Promotion and Rehabilitation.