The axolotl can regenerate its heart, brain, and spinal cord — unlike any other vertebrate.

The human body is about 60% water.

Fact #45 · Human Body

The Earth is about 4.5 billion years old.

Fact #172 · Human Body

The Earth's outer core is liquid metal.

Fact #250 · Human Body

Water covers more than 70% of Earth's surface.

Fact #86 · Human Body

The Earth completes one full rotation approximately every 24 hours.

Fact #153 · Human Body

The Sumerians developed one of the earliest known writing systems.

Fact #644 · Human Body

The Moon was formed billions of years ago.

Fact #313 · Human Body

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

Fact #773 · Human Body