The human skull has 22 bones — only the mandible (jaw) is movable.

Polar bears have a thick layer of fat to retain body heat.

Fact #867 · Human Body

Some insects have compound eyes made of many lenses.

Fact #513 · Human Body

The Tyrannosaurus rex may have had excellent vision.

Fact #687 · Human Body

The human brain contains roughly 86 billion neurons.

Fact #8 · Human Body

Certain sea slugs can incorporate stinging cells from their prey.

Fact #566 · Human Body

The average adult human has 32 teeth.

Fact #152 · Human Body

The Nile River has supported civilizations for thousands of years.

Fact #170 · Human Body

Fossils form when organisms are preserved in sediment over millions of years.

Fact #678 · Human Body