The human eye can distinguish approximately 10 million different colors.

Insulin was first used to treat diabetes in the early 1920s.

Fact #1189 · Human Body

An adult giraffe can clean its ears with its tongue.

Fact #248 · Human Body

The Peloponnesian War lasted nearly three decades.

Fact #1442 · Human Body

The human spine consists of 33 vertebrae.

Fact #192 · Human Body

Polar bears have black skin beneath their white fur.

Fact #26 · Human Body

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

Fact #441 · Human Body

The human body is about 60% water.

Fact #45 · Human Body

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

Fact #266 · Human Body