White matter — the 'wiring' of the brain — develops through adolescence and into the 20s.

The human stomach can expand significantly after a large meal.

Fact #101 · Human Body

The saber-toothed cat went extinct around 10,000 years ago.

Fact #715 · Human Body

The Earth's inner core is solid despite extreme heat.

Fact #217 · Human Body

A sloth can take up to a month to digest a single meal.

Fact #441 · Human Body

Your brain uses patterns to recognize faces almost instantly.

Fact #1752 · Human Body

The human body contains trillions of cells.

Fact #142 · Human Body

The Tyrannosaurus rex may have had excellent vision.

Fact #687 · Human Body

The Sumerians developed one of the earliest known writing systems.

Fact #644 · Human Body