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| A cure for blindness |
Superstition from medieval Europe: supposedly a blind person could be cured if a black cat’s head was burned, turned into a powder and blown into the eyes of the blind person three times a day.
Unlike the last item, this rather foolish theory could be proved—or, rather, disproved. No doubt some people did try it, and we can only hope they used the head of a black cat that had already died.
