The ballpoint pen was invented in 1938 by László Bíró, a journalist frustrated by fountain pens smearing his work.

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

Fact #68 · History

Fossilized trees provide clues about ancient climates.

Fact #696 · History

The Sahara Desert was once home to ancient civilizations.

Fact #280 · History

Greek hoplites fought in tight formations known as phalanxes.

Fact #1424 · History

The Roman legion was one of the most effective military formations of the ancient world.

Fact #1425 · History

The CIA funded cultural organizations during the Cold War as part of influence efforts.

Fact #1076 · History

The Manhattan Project was a secret U.S. program during World War II to develop atomic weapons.

Fact #1039 · History

The Persian Empire built a vast administrative system.

Fact #653 · History