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And speaking of fluttering, don't forget eyelashes. Your friend's eyelids shut automatically to protect the eye from possible danger. And if you flutter your fingers close (but not too close!) to your friend's eyes, you'll be sure to see your friend's eyes blink. When you step into bright light, for example, the eyelids squeeze together tightly to protect your eyes until they can adjust to the light. The eyelid also has great reflexes, which are automatic body responses, that protect the eye. This is called blinking, and it's both a voluntary and involuntary action, meaning you can blink whenever you want to, but it also happens without you even thinking about it. The lid helps keep the eye clean and moist by opening and shutting several times a minute. The eyelid protects the front part of the eye. The eye is about as big as a ping-pong ball and sits in a little hollow area (the eye socket) in the skull. Most friends won't say OK if you ask to see their liver!

Some of the eye's parts are easy to see, so most friends will say OK.

You can check out different parts of the eye by looking at your own eye in the mirror or by looking at (but not touching) a friend's eye. So, come on - let's take a tour of its many parts. You can see that the eye's pretty amazing. Then they send the information to your brain for processing so the brain knows what's going on outside of your body. They take in tons of information about the world around you - shapes, colors, movements, and more. Your eyes are at work from the moment you wake up to the moment you close them to go to sleep. Which part of your body lets you read the back of a cereal box, check out a rainbow, and see a softball heading your way? Which part lets you cry when you're sad and makes tears to protect itself? Which part has muscles that adjust to let you focus on things that are close up or far away? If you guessed the eye, you're right!