Did you know that Paris once ran all its clocks using a pneumatic system? In an era when electricity was still a mysterious force, the city devised a clever solution to keep time synchronized across town. Buried pipes sent a burst of air every 60 seconds to move the hands of the clocks forward. This network ensured that whether you were checking the time in public squares or private homes, all clocks stayed in sync, powered by nothing but air and ingenuity.

[Via Neatorama]