Humans are the only animals that produce emotional tears.

The Thirty Years’ War affected much of Central Europe.

Fact #1171 · Human Body

Your stomach replaces itself every few days.

Fact #1696 · Human Body

The human body glows faintly in complete darkness.

Fact #1686 · Human Body

Some birds have hollow bones to reduce body weight for flight.

Fact #889 · Human Body

The human body produces heat through metabolism.

Fact #116 · Human Body

In 1920, a town in Minnesota briefly elected a bear as mayor in a publicity stunt.

Fact #773 · Human Body

The Earth's mantle is composed of semi-solid rock.

Fact #329 · Human Body

Water is the only natural substance that commonly exists as a solid, liquid, and gas on Earth.

Fact #175 · Human Body