That's a case of "broken clock right twice a day". Out of the tens of thousands (hundreds of thousands?) of medieval so-called remedies it turns out _one_ is a

That's a case of "broken clock right twice a day". Out of the tens of thousands (hundreds of thousands?) of medieval so-called remedies it turns out _one_ is accidentally useful. It would be more surprising if absolutely none of the remedies were useful. You'd expect at least one or two hits just from chance.