" Soranus of Ephesus (AD 98–138) seems to have discovered lithium as a cure for manic depression by recommending that severely disturbed patients be treated with the alkaline waters of the town, which contained high levels of lithium salts. A more radical approach consisted of a pioneering form of electric shock treatment: the Greeks used the ‘electric torpedo’, or eels, as a cure for headaches, believing that ‘the touch of a living torpedo stupefied or blunted the acute sense of pain’. An oil was prepared from the dead fish for use when no live ones were available. "

― Catharine Arnold , Bedlam: London and Its Mad