Ancient Earthquake Alarm: How a 200 BC Seismograph Changed History!

Описание: Discover the incredible story of Zhang Heng's ancient seismograph, invented around 200 BC in China. This bronze urn with dragon heads could detect earthquakes hundreds of miles away, offering early warnings long before modern technology. Learn how this ancient innovation saved lives and laid the foundation for earthquake detection. Watch now to explore one of history's most fascinating inventions and see how ancient tech still inspires us today!