The muscle responsible for blinking — orbicularis oculi — is one of the fastest in the body.

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

Fact #86 · Human Body

The Dead Sea is one of the saltiest bodies of water on Earth.

Fact #266 · Human Body

The human body contains trillions of cells.

Fact #142 · Human Body

Many insects have exoskeletons that protect them from dehydration.

Fact #876 · Human Body

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

Fact #715 · Human Body

The Sumerians developed one of the earliest known writing systems.

Fact #644 · Human Body

The gulper eel has a large mouth that allows it to swallow prey bigger than its body.

Fact #1386 · Human Body

The first forests appeared during the Devonian period.

Fact #710 · Human Body