If you have never seen the inside of a small electric motor such as the one used in this Snack, try taking one apart. Use a broken one if possible, but a new one is not very expensive and its loss is well worth the experience.
Check Your Hearing: Two Kinds of Hearing Loss
If you have access to a tuning fork, you can perform two simple hearing tests, the Rinne Test (pronounced reh-NAY), and the Weber Test, both of which distinguish between conductive and sensorineural hearing loss. Look them up to learn how to perform them.
In conductive hearing loss, sound vibrations are not being transmitted from the outer ear to the cochlea because of an ear-wax blockage, fluid accumulation in the ear (e.g., due to an ear infection), a damaged ear drum, or arthritis of the tiny bones of the middle ear. When you stick your fingers in your ears, you are simulating conductive hearing loss.
In sensorineural hearing loss, your brain is not receiving nerve signals from the inner ear, even though sound vibrations may be reaching this organ. In the majority of cases, hair cells in the cochlea are damaged, often by exposure to loud noise.
So, what does this mean for improving your hearing by rerouting audio through your jaw? If you’ve got a cold or an injured ear drum, you might be in luck, although the signal lacks the amplification it would otherwise get. But if you’ve been spending a lot of time in mosh pits or blaring Rachmaninoff through your earbuds at top volume, you may be listening to the sound of silence.