There is enough gold in Earth's core to coat the entire surface in a 1.5-foot layer.

Octopuses have three hearts and blue blood.

Fact #1 · Human Body

The Megalodon lived millions of years before humans appeared.

Fact #704 · Human Body

Some sharks can sense a drop of blood from far away.

Fact #348 · Human Body

Some insects have compound eyes made of many lenses.

Fact #513 · Human Body

Ankylosaurs had armored bodies and clubbed tails.

Fact #629 · Human Body

Fossilized bones reveal information about prehistoric diets.

Fact #737 · Human Body

The vaccination syringe improved medical delivery methods.

Fact #1576 · Human Body

A sea anemone uses stinging cells to capture prey.

Fact #437 · Human Body