Hippopotamuses secrete a reddish fluid that helps protect their skin.

The Earth's rotation is gradually slowing over time.

Fact #105 · Human Body

Hyenas have powerful jaws adapted for crushing bone.

Fact #1274 · Human Body

The Thirty Years’ War affected much of Central Europe.

Fact #1171 · Human Body

The human brain continues to develop into early adulthood.

Fact #83 · Human Body

The fennec fox has large ears that help dissipate heat.

Fact #865 · Human Body

The Moon was formed billions of years ago.

Fact #313 · Human Body

The human skeleton is made up of over 200 bones in adulthood.

Fact #34 · Human Body

The Olympic Games are held every four years.

Fact #923 · Human Body