This Ancient Chinese Machine Could Sense Earthquakes 500 Kilometers Away (And It Was Built 1,900 Years Ago)
In 132 AD, Chinese inventor Zhang Heng created the world’s first earthquake detection device that could sense tremors 500 kilometers away using bronze dragons and an ingenious pendulum mechanism. This remarkable seismoscope utilized scientific principles that wouldn’t be understood in the Western world for another 1,500 years.
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