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Chinese astronomer Chang Heng (Ad 78-139) invented an earthquake detector made of a vase and adorned with dragons heads and sorrounded by metal frogs. In each of the dragons jaws was a carefully balanced ball. When the first tremors of an earthquake made to device vibrate, making a noise to warm of the coming danger.
Really? Legit? Hahaha earthquake lang talaga ma dedetect nila? Kung may dumaan lang na malaking jeep d talaga sila mag iingay? Hahaha thank you for sharing that earthquake detector lods