Stress hormones prepare the body for a fight-or-flight response.

The cornea of the eye has no blood vessels — it gets oxygen directly from the air.

Fact #3497 · Human Body

Your mind exists inside your brain.

Fact #2303 · Human Body

Your brain builds awareness.

Fact #2395 · Human Body

Teeth are the only part of the human body that cannot repair themselves.

Fact #3509 · Human Body

The human eye can distinguish about 10 million different colors.

Fact #3266 · Human Body

Your bones are stronger than steel of the same weight.

Fact #2343 · Human Body

An individual blood cell takes about 60 seconds to complete a full circuit of the body.

Fact #2616 · Human Body

Teeth are the only part of the body that cannot heal themselves.

Fact #3279 · Human Body