How do we hear?
Hear a pin drop. Hear some car keys jingle. Hear a bird chirping outside. Humans have the ability to hear sound waves between 20 hz and 20000 hz. We use sound waves to communicate, to sense danger (i.e. a tree falling) or even to drive a car. Our ears help us detect sounds coming from many directions. Humans can tell if a pin dropping is in front, behind or on either side of them. This is all due to air pressure and our ability to sense changes around us. If a pin drops to our left, the sound wave from the pin will take longer to seach our right ear than our left ear. That os how we know the pin fell on the left side. Then how do oir ears actually work?