For most of human history, nobody needed an alarm clock. Work followed the sun. Time was fluid. Then the Industrial Revolution happened — and everything changed. The alarm clock didn't just wake people up. It synchronized all of humanity.

Have you ever wondered how cities kept time before the era of electronic clocks? In this video, we'll dive into the fascinating story of the Paris underground clock system. Developed by Austrian engineer Victor Popp in the late 19th century, this ingeniou...