A new type of medical treatment has helped a toddler who was born deaf to be able to hear without a hearing aid.
Ears usually work by catching sound waves and directing them towards the ear canal, which goes in from the part of the ear that you can see. The sound waves cause vibrations inside ear. Part of the inner ear, the cochlea, looks like a snail’s shell. It is filled with lots of tiny hair cells that create a small electrical signal when they vibrate. The signal is sent to the brain, which understands it as sound.
