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, 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.