Mysterious acoustic emission

There is a physical phenomenon that has accompanied humanity for thousands of years. Already in the Stone Age, people heard the sounds of breaking branches, sounds coming from eating dry food, shelling nuts. In the Bronze and Iron Ages, sounds related to metalworking were added. For several thousand years, the phenomenon had no name, the mechanisms of the emission of sound waves into the environment were not known. Scientific work began only 100 years ago. The name of acoustic emissions was created, the mechanism of the phenomenon and the methods of its study were explained. The mechanism of the formation of spontaneous acoustic emission in the ear has not been satisfactorily explained. Thousands of works and very numerous hypotheses have been created, which in itself proves that none of them is final and each has certain flaws. The final part presents some reservations about the current theory of the formation of spontaneous acoustic emission in the ear.