Some fish, like the lungfish, can survive out of water for years — buried in dried mud in a state of estivation.

Your bones are stronger than steel.

Fact #1716 · Human Body

The barreleye fish has a transparent head and upward-facing eyes.

Fact #1390 · Human Body

A polar bear's fur is actually transparent.

Fact #391 · Human Body

Tyrannosaurus rex had teeth that could grow over 12 inches long.

Fact #619 · Human Body

Pandas have a specialized wrist bone that functions like a thumb.

Fact #1237 · Human Body

The human eye can detect a single photon.

Fact #1706 · Human Body

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

Fact #338 · Human Body

The human nose can distinguish thousands of different scents.

Fact #107 · Human Body