Back in medieval times, " I said, "we used oil of vitriol for its healing properties. No doubt that's why Commodus had some in his infirmary. Today we call it sulfuric acid."Meg flinched. "Isn't that dangerous?""Very.""And you *healed* with it?""It was the Middle Ages. We were crazy back then.
Rick Riordan, The Dark Prophecy
funny, medicine