Your small intestine is lined with 600 tiny folds — increasing its surface area to the size of a tennis court.

The human body contains trillions of cells.

Fact #142 · Human Body

The heart can sometimes restart after stopping.

Fact #3075 · Human Body

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

Fact #3279 · Human Body

The human heart pumps blood through the circulatory system.

Fact #99 · Human Body

Your brain fills in your blind spot so you never notice it exists.

Fact #2246 · Human Body

The human body replaces many of its cells regularly.

Fact #182 · Human Body

Goosebumps are a vestigial reflex — in our hairier ancestors, they made fur stand up to appear larger or stay warm.

Fact #3505 · Human Body

The human brain uses about 20% of your body's total energy.

Fact #2340 · Human Body