Video narration
Imagine divers lifting a corroded lump of bronze from a shipwreck off a Greek island. It looked like wreckage, and for years it sat unnoticed in a museum. Then someone noticed gears inside. X-rays showed dozens of tiny bronze gears, cut by hand. This wasn't an ornament. It was a machine. The Antikythera Mechanism worked a little like a clock: turn a crank, and interlocking gears move the dials. They tracked the sun and moon across the sky and showed the moon's phases. It predicted eclipses years ahead and counted down to the next Olympic Games. This lump was a calculator for the heavens, often called the world's first analog computer: a machine that used moving parts to work things out. And then the trail goes quiet. For more than a thousand years, nothing this complex appears again.