And a replica has been presented this month in its inventor's hometown, Zhengzhou (Henan Province, central China). It isn't the first attempt at reconstructing the Houfeng Didong Yi (Instrument for inquiring into the wind and the shaking of the earth), but it is the first one that actually works and could detects an earthquake the same way the original Later Han device (132 AD) did. Or at least, so it is believed.

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