The Evolution of the Clock: From Ancient Sundial to the Atomic Clock ⏰

From a stick casting shadows in ancient Egypt to the cesium atoms that keep your phone on time — this is the incredible true story of the clock. ⚙️⏰ Discover how sundials, water clocks, hourglasses, mechanical towers, pocket watches, and quartz crystals led to the atomic clock — accurate to one second in 1.4 million years. New documentaries every day on From First to Future. Subscribe for more stories of how we got here! #clock #evolution #FromFirstToFuture