Your ears never stop working, even when you're asleep — your brain just filters the sounds out.

Your brain uses patterns to recognize faces almost instantly.

Fact #1752 · Human Body

The saber-toothed tiger is more accurately called Smilodon.

Fact #625 · Human Body

The human eye can detect a single photon.

Fact #1706 · 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 first successful kidney transplant occurred in 1954.

Fact #1221 · Human Body

The Olympic Games are held every four years.

Fact #923 · Human Body

Fossils are formed when remains are preserved in rock over millions of years.

Fact #631 · Human Body