🌏⚙️ 2,400 Years Ago, China Built an Earthquake Detector — Without Electricity 🤯 Over 2,400 years ago, China created a mechanical device that could detect earthquakes — long before electronics or modern seismology existed 🧠✨ Invented by Zhang Heng, the machine used gravity, levers, and precision engineering to detect distant quakes and even indicate their direction 🌍⚖️ No sensors. No power. Just pure mechanical brilliance 🛠️ This ancient seismograph proves that advanced engineering existed t
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