The Antikythera mechanism, found in a shipwreck dating to around 65 BC, was an analog computer over 2,000 years old containing at least 30 precision-cut bronze gears.

Scientists have not been able to fully replicate the Antikythera mechanism despite over a century of study.

Humanity did not create anything as mechanically complex as the Antikythera mechanism for another 1,400 years after its construction.

The Antikythera mechanism could predict solar and lunar eclipses, track the positions of the five known planets, calculate Olympic Games dates, and model the moon's irregular orbit.