Cochlea a protein motor called prestin on their outer membranes; it generates additional movement that couples back to the fluid–membrane wave. This "active amplifier" is essential in the ear's ability to amplify weak sounds. The active amplifier also leads to the phenomenon of soundwave vibrations being emitted from the cochlea back into the ear canal through the middle ear (otoacoustic emissions). Otoacoustic emissions are due to a wave exiting the cochlea via the oval window, and propagating back through the middle ear to the eardrum, and out the ear canal, where it can be picked up by a microphone. Otoacoustic emissions
Gold Is Where You Find It February 12, 1938 by Warner Bros. Pictures. A new gold strike in California ten years after the American Civil War triggers a bitter feud between farmers and miners using hydraulic mining methods that flood the farmlands. "Gold is Where You Find It" was, in many respects, a routine Western, lifted out of the ordinary by its early use of the newly perfected 3-strip Technicolor process, its big-budget director and cast, and its musical score. During the early spring of 1937, producer Hal B. Wallis was looking for a project to film in Technicolor, as a dry run for "The Adventures