History
The Antikythera Mechanism: An Ancient Computer and Its Mysteries
Quick fact
The Antikythera Mechanism's 30+ bronze gears are so advanced that historians believe their technology wasn't replicated until the 14th century.
Why this is interesting
You've probably seen a wristwatch with a calendar—but what if a device from 150 BC could predict eclipses and track the Olympic Games? The ancient Greeks built exactly that, an intricate bronze computer found at the bottom of the sea.