Anne Parrish found a childhood book she owned in a Paris bookstore years later.

Cats have a reflective layer in their eyes that improves night vision.

Fact #1367 · Human Body

A blue whale's heart can weigh over 400 pounds.

Fact #104 · Human Body

In 1809, two countries declared war and then forgot to sign a peace treaty for years.

Fact #805 · Human Body

The human eye has a natural blind spot.

Fact #126 · Human Body

Water is the only natural substance that commonly exists as a solid, liquid, and gas on Earth.

Fact #175 · Human Body

Polar bears have black skin beneath their white fur.

Fact #26 · Human Body

A hyena’s jaw is powerful enough to crush bone.

Fact #502 · Human Body

An African elephant's ears help regulate its body temperature.

Fact #445 · Human Body