The human body contains enough iron to make a 3-inch nail.

The human nervous system can send signals at over 200 miles per hour.

Fact #2642 · Human Body

Puppies are born blind and deaf.

Fact #1344 · Human Body

There are signals traveling through your nervous system right now at speeds over 200 miles per hour.

Fact #2497 · Human Body

Your corneas receive no blood supply — they get oxygen directly from the air.

Fact #3275 · Human Body

Your heart beats about 3 billion times over an average lifetime.

Fact #2679 · Human Body

The human eye adapts to darkness by increasing light sensitivity.

Fact #899 · Human Body

Your body replaces most of its atoms over time.

Fact #2289 · Human Body

The average human body contains about 37 trillion cells.

Fact #3280 · Human Body