Your small intestine is about 20 feet long, and its inner surface area is roughly the size of a studio apartment.

A human brain generates enough electrical activity to be measured outside the skull.

Fact #2500 · Human Body

The human body can survive about 3 days without water.

Fact #3064 · Human Body

Your bones are roughly five times stronger than steel by weight.

Fact #3503 · Human Body

The human eye adapts to darkness by increasing light sensitivity.

Fact #899 · Human Body

The human body replaces many of its cells regularly.

Fact #182 · Human Body

People can survive extreme dehydration briefly.

Fact #3078 · Human Body

Your brain can store the equivalent of millions of gigabytes of information.

Fact #1908 · Human Body

The human brain contains billions of neurons involved in thinking.

Fact #2983 · Human Body