It takes 17 different muscles to form a smile. It takes twice that many to frown. So smiling is easier!

Our eyes never grow. This is why babies’ eyes seem so much larger, as their bodies have not grown around them to match.

The colored part of the eye, the iris, is actually a ring of muscle that controls the size of the pupil.

The tongue is the only muscle in the human body not attached at both ends.

People blink less when they’re lying, but after they’ve finished talking, will tend to blink more.

The cornea of the eye is the only part of the body without an internal blood supply.  It actually gets all the oxygen it needs to function from the air.

When you blush, the reaction in your body not only turns your cheeks red but makes the lining of your stomach blush too.

There are more bacteria in your mouth than there are people in the world.