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TIL the moldy bread theory has been debunked, but still remains
I never even knew there was a theory like this to explain the Salem witch trials. I always assumed that everyone understood it as a case of superstition and suspicion run amok, I mean we even use the term "witch hunt" for such cases these days.
I have heard the ergot theory to explain dancing plagues, but those are fringe theories as well and not really accepted as a likely cause.