* The human eye can see more colors than a camera.
* The cornea is the clear outer layer of the eye that covers the iris and pupil.
* The iris is the colored part of the eye.
* The pupil is the black hole in the center of the iris that light enters the eye.
* The lens is a transparent structure behind the iris that helps to focus light on the retina.
* The retina is the light-sensitive tissue at the back of the eye that converts light into electrical signals that are sent to the brain.
* The macula is a small area in the center of the retina that is responsible for sharp central vision.
* The optic nerve is a bundle of nerve fibers that carries visual information from the retina to the brain.
Ears
* The human ear can hear sounds as low as 20 hertz and as high as 20,000 hertz.
* The outer ear is the visible part of the ear that collects sound waves and directs them into the ear canal.
* The ear canal is a tube that leads from the outer ear to the middle ear.
* The middle ear is a small cavity that contains the eardrum and three small bones called the malleus, incus, and stapes.
* The eardrum is a thin membrane that vibrates when sound waves hit it.
* The malleus, incus, and stapes are three small bones that amplify the vibrations of the eardrum and transmit them to the inner ear.
* The inner ear is a fluid-filled labyrinth that contains the cochlea, semicircular canals, and vestibular system.
* The cochlea is a spiral-shaped tube that contains the auditory receptors.
* The semicircular canals are three fluid-filled tubes that help with balance.
* The vestibular system is a series of fluid-filled sacs and tubes that help with balance.