The Persian Empire built a vast administrative system.

Ancient Greece made contributions to mathematics and philosophy.

Fact #292 · History

The discovery of Helicobacter pylori changed treatment for ulcers.

Fact #1215 · History

The steam engine played a major role in the Industrial Revolution.

Fact #68 · History

The city of Hattusa was the capital of the Hittite Empire.

Fact #1651 · History

Humans often prefer immediate rewards over delayed ones.

Fact #987 · History

The Crusades were a series of religious wars during the Middle Ages.

Fact #1144 · History

The Treaty of Versailles officially ended World War I.

Fact #613 · History

The Reconstruction era followed the Civil War.

Fact #1125 · History