If you ask a pair of happy parents-to-be who have what’s hopes for their babies, although the answers will be varied, [healthy and intelligent] will definitely become the top hot word. Smart, intelligent, intelligent, hearing is the most important feeling in the human body after vision. How is hearing produced? The vibration of an object will produce sound waves, and when the ear receives the sound waves, it will produce hearing. The human ear consists of three parts: the outer ear, the middle ear and the inner ear. The outer ear is the visually visible ear, which is like a small funnel and is responsible for collecting sound stimuli. The middle ear transmits the vibration of sound to the inner Read More …