The Earth's interior is layered into crust, mantle, and core.

There are more possible shuffles of a deck of cards than seconds since Earth formed.

Fact #1675 · Human Body

The human nose can distinguish thousands of different scents.

Fact #107 · Human Body

Some insects have compound eyes made of many lenses.

Fact #513 · Human Body

Your brain predicts events before you consciously experience them.

Fact #1742 · Human Body

The Earth's inner core is primarily iron and nickel.

Fact #150 · Human Body

The brain named itself.

Fact #1692 · Human Body

A narwhal’s tusk is actually an elongated tooth.

Fact #551 · Human Body

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

Fact #1189 · Human Body