there was a Chinese astronomer,
in AD 78-139,named Chan Heng
he made a earthquake detector,
i am not talking about a coaster,
it was adorned with dragon heads,
surrounded by metal frogs,
i'm not talking cats and dogs,
in each of the dragons' jaws,
was a carefully balanced ball,
it gives out a syrun call,
whenever there was an
EARTHQUAKE!!
as the balls fall down,
in the frogs mouth
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