Zhang Heng invented an early device for detecting these; when one occurred a ball fell from a dragon's head into a frog's mouth

If you are looking for the Zhang Heng invented an early device for detecting these; when one occurred a ball fell from a dragon's head into a frog's mouth answer and solution then you have come to the right place. This question aired today (May 30 2023) in the popular Jeopardy! TV Show. If you would like to know the answer then continue reading below:

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